Image intensifiers used in night-vision devices create a bright image from dim light by letting the light first fall on a photocathode. Electrons emitted by the photoelectric effect are accelerated and then strike a phosphorescent screen, causing it to glow more brightly than the original scene. Recent devices are sensitive to wavelengths as long as 900 , in the infrared: Part A If the threshold wavelength is 900 , what is the work function of the photocathode? Part B If light of wavelength 600 strikes such a photocathode, what will be the maximum kinetic energy, in , of the emitted electrons?

Answer: 20.7 m/s.

Explanation: To find the speed of the car, we need to use the equation for centripetal force, which is:

Fc = m * a = m * v^2 / r

where Fc is the centripetal force, m is the mass of the car, a is the centripetal acceleration, v is the velocity of the car, and r is the radius of the turn.

We know that the coefficient of friction between the car and the road is 0.57

and it is the maximum speed, so the force of friction is equal to the centripetal force.

f = Fc = m * a = m * v^2 / r

f = μ * N = μ * m * g

so

m * v^2 / r = μ * m * g

where g is the acceleration due to gravity.

By substituting the known values into the equation, we get:

(1100 kg) * v^2 / (12 m) = (0.57) * (1100 kg) * (9.8 m/s^2)

Solving for v, we get:

v = sqrt((0.57 * 9.8 * 12 * 1100) / 1100)

v ≈ 20.7 m/s

To the nearest tenth, the speed of the car is 20.7 m/s.

The shortest-wavelength (in nm) x rays produced by the television is when a cathode-ray tubes that generated the picture in early color televisions were sources of x rays is 0.85Å.

Given the accelerating voltage in a television tube (V) = 14.6KV

We know that from energy equation E = eΔV where e is the charge.

Also E = hc/∧ where h is planck's constant, c is the speed of light and ∧ is the wavelength of light.

So by comparing above equations, we say that

eΔV = hc/∧ where hc = 1240eV

e x 14.6 x 10^3 V = 1240/∧ eV

∧ = 1240/14.6 x 10^3 = 8.5 x 10^-2 nm = 0.85Å.

Hence the the shortest-wavelength (in nm) x rays produced by the television is 0.85Å.

To learn more about wavelength click here https://brainly.com/question/13533093

#SPJ4

A wave in which the particles of the medium move in the same direction as the wave is a longitudinal wave.

To learn more about longitudinal wave from the given link:

https://brainly.com/question/8497711

#SPJ1

No digestion is needed in alcohol absorption. Is statement about alcohol's path through the human body .

What is absorption in biology?

Absorption is the process by which the products of digestion are absorbed by the blood to be supplied to the rest of the body. During absorption, the digested products are transported into the blood or lymph through the mucous membrane.

What is meant by adsorption and absorption?

Adsorption and absorption mean quite different things. Absorption is where a liquid is soaked up into something like a sponge, cloth or filter paper. The liquid is completely absorbed into the absorbent material. Adsorption refers to individual molecules, atoms or ions gathering on surfaces.

To know more about absorption visit

https://brainly.com/question/29431264

#SPJ1

The speed of the car is 20 m/s. Therefore, Option D is correct

We know that Speed (S)= Distance (D) / Time (T)

Here, Distance (D)= 200 meters

Time (T) = 10 seconds

Therefore,

Speed= 200/10

Speed= 20m/s

Learn more about speed and distance at:

https://brainly.com/question/22242439

The far point of a myopic person with a prescription of -4.00 D is the point at which the eye can focus clearly on objects without the aid of corrective lenses.

Object is an entity that possesses state and behavior. It can be physical or a virtual component. In programming, an object is a self-contained component which consists of both data and procedures/functions to manipulate the data. Objects can interact with other objects, and the interaction between objects forms the basis of object-oriented programming.

This point is approximately 4 meters (13 feet) away from the eye. The far point is the furthest point away from the eye at which a person with myopia can see clearly. In other words, the person with -4.00 D myopia can see clearly with their corrective lenses up to 4 meters away from them. Beyond that point, the person will need to use their corrective lenses to see clearly.

To know more about object click-

https://brainly.com/question/11929974

#SPJ4

Electron configuration is the distribution of electrons of an atom in the atomic orbitals in the increasing order of their atomic energies.

As a result, the orbitals are filled in the following order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p

The electrons found in the outermost shell are referred to as

valence electrons. In contrast, the electrons found in the innermost shell or the lowest energy levels are called core electrons.

(A) The electron gain enthalpy is exothermic and is more than those required for dissociation and I.E of H

(B) If total heat of the reaction is negative , it is clear that the reaction proceed from left to right.

The ground-state electron configuration of a noble gas is ns2 np6

The noble gas elements' shells are completely filled, resulting in a stable electronic configuration. Hence, removing the first electron from the stable configuration necessitates a great amount of energy.

Thus, noble gases have a high ionization energy value.

Learn more about atomic orbitals  here :

https://brainly.com/question/28240666

#SPJ4

Answer: 6.45 m/s

Explanation:

Find out the time value

3 = 1/2*a*T^2

6/10 = t^2

t = 0.77 seconds

and the distance is given as 5 m

thus speed,= distance/time.

Putting values,

speed = 5/0.77

= 6.45 m/s

To know more about finding speed,

brainly.com/question/28260925

brainly.com/question/11033032

Since volume grows as a cube of radius, a planet with a 1.5 earth radius would have a volume that is 1.53, or roughly 3.375 times that of the current Earth.

Given that Earth has a density of 5.513 g/cm3, its new density would be around 1.63 g/cm3 if its radius were doubled by 50% but its mass remained constant. Jupiter has a density of 1.326 g/cm3 as a point of comparison. However, it's possible that you're referring to what would happen if both size and mass were scaled appropriately, making this new Earth identical to existing super-earths with 1.5 earth radii. The density would then be around 6-7 g/cm3.

Learn more about density here-

https://brainly.com/question/27962091

#SPJ4

To find the maximum and minimum velocities that the ball can have and still land in the trunk of the truck, we need to use the equations of motion for the horizontal and vertical positions of the ball as a function of time. Since the truck is moving away from the ball, the horizontal position of the ball will be given by:

x(t) = x0 + Vt - v0cos(θ)*t

Where x0 is the initial horizontal distance from the back of the truck to the ball, V is the velocity of the truck, t is the time, and v0 is the initial velocity of the ball.

Similarly, the vertical position of the ball will be given by:

y(t) = y0 + v0*sin(θ)*t - (1/2)gt^2

Where y0 is the initial height of the ball, v0 is the initial velocity of the ball, g is the acceleration due to gravity and t is the time.

We know that the ball will land in the trunk of the truck if the horizontal position of the ball is equal to the length of the trunk (L) at the same time that the vertical position of the ball is equal to the initial height of the ball (y0).

We can find the time of flight by setting y = 0,

t = (2v0sin(θ))/g

Now, we substitute this value of t and y0 = 0 in the equation of x(t) and equate it with L.

x0 + Vt - v0cos(θ)*t = L

We can solve this equation for v0 to get the initial velocity of the ball.

v0 = (L + x0cos(θ) - Vt)/(cos(θ) - t*sin(θ))

Finally, we know that the minimum and maximum initial velocities will correspond to the maximum and minimum values of sin(θ) and cos(θ). Since θ = 45°, we can find the maximum and minimum velocities as follows:

v0_max = (L + x0cos(45) - Vt)/(cos(45) - tsin(45))

v0_min = (L + x0cos(45) - Vt)/(cos(45) + tsin(45))

Note that in this case x0=5m, L=2.5m, θ=45°, V=9m/s, t = (2v0sin(45))/g and g is 9.8m/s^2

you can use these values to find out v0_max and v0_min.

The magnitude of the total flux through the five non-shaded faces is 5 times the magnitude of the flux through a single face.

What does total flux mean?

Total flux is a measure of the overall rate of flow of a physical quantity, such as energy or particles, through a given surface or region. It is typically expressed as the total amount of the physical quantity that passes through the surface or region per unit time.In other words, total flux is a measure of the overall rate at which something is being transferred across a given area.

What does Magnatitude means?

Magnatitude is a term used to describe the strength or intensity of something, such as an emotion, a physical force, or an event. It is often used to describe the intensity of an earthquake, hurricane, or other natural disaster. In some cases, the term can also be used to describe the power of a person or group, such as the magnatitude of a leader's influence or the magnatitude of a corporation's reach.

Therefore, the magnitude of the total flux through the five non-shaded faces is 5 times the magnitude of the flux through a single face, or 5F, where F is the magnitude of the flux through a single face.

To know more about Total Flux,

https://brainly.com/question/26289097

#SPJ4

These two situations will allow you and a friend to share the same region of spacetime: you are both side by side and travelling at constant speed; or you are both side by side and at rest.

A particle gains constant velocity when it crosses an equal-length linear path multiple times at regular intervals. The uniform speed of a particle travelling in a straight line at a constant speed is another definition. This means that the particle will move along a straight line at constant speed. In physics, the concept of spacetime refers to a mathematical model that unifies an inertial reference frame of space and time (x, y) with a non-inertial reference frame of space and time (x', t') to create a four-dimensional model that connects a position to the field.

Learn more about speed here

https://brainly.com/question/28224010

#SPJ4

For a given process at constant pressure, w is positive. this means that the process involves work being done by the system on the surroundings

Work (w) is a term used in thermodynamics to describe the transfer of energy from a system to its surroundings. The formula w = -PV determines how much work a system does on its surroundings while a process takes place at constant pressure. P represents the constant pressure, while V represents the system's volume change.

As long as the pressure remains constant, the effort will be directly proportional to the transpose in volume. The work the system performs on its surroundings changes from negative to positive as its volume increases, transferring energy from the system to its setting in the form of work. This is consistent with the statement that the process involves the system working on the environment.

Read more about work done on:

https://brainly.com/question/25573309

#SPJ4

Consequently, the turntable's angular velocity when the elephant reaches its center is [tex]$1.459 \mathrm{rad} / \mathrm{sec}$[/tex]

The giant performs 37945.68J of work while walking to the center.

Using conservation of angular momentum

[tex]& I_1 \omega_1=I_2 \omega_2[/tex]

Where [tex]I_1[/tex] is equal to [tex]& \left(\frac{1}{2} M r^2+m r^2\right)[/tex]

Substitute the value in above equation we get,

[tex]& \left(\frac{1}{2} M r^2+m r^2\right) \omega_1=\left(\frac{1}{2} M r^2\right) \omega_2[/tex]

Notice that [tex]$I_2$[/tex] (moment of inertia for elephant) is zero as he is at the centre.

Given M is equal to 11 Mg.

where m is equal to 4.8Mg

While radius is given as 8.5m

Substitute the value in above angular momentum equation we get.

[tex]& \left(\frac{1}{2} \times 11000 \mathrm{~kg} \times(8.5 \mathrm{~m})^2+4800 \mathrm{~kg} \times(8.5 \mathrm{~m})^2\right) 0.15 \mathrm{rad} / \mathrm{sec}[/tex]

Further we get

[tex]\\=\left(\frac{1}{2} \times 1100 \times(8.5)^2\right) \omega_2[/tex]

[tex]& (39737.5+346800) 0.15=39737.5 \omega_2 \\& \omega_2=1.459 \mathrm{rad} / \mathrm{sec}[/tex]

Angular velocity of the turntable when the elephant reaches the center is [tex]$1.459 \mathrm{rad} / \mathrm{sec}$[/tex]

(b)

Work done is equal to change in rotational kinetic energy

[tex]\mathrm{W} & =\frac{1}{2} I_2\left(\omega_2\right)^2-\frac{1}{2} I_1\left(\omega_1\right)^2[/tex]

Substitute the value in above equation we get,

W=42294.23 - 4348.55

W=37945.68J

Work done by the jumbo in walking to the centre is 37945.68J

For such more question on Work done.

https://brainly.com/question/8119756

#SPJ4

The angle of refraction in the glass is 37.51 degree

The angle of incidence when light travels from air to water of refractive index 4/3 and then to glass of refractive index 1.60 is 60 degrees. To calculate the angle of refraction in the glass, we can use Snell's law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indices of the two materials.

Sin(incident angle) / Sin(refraction angle) = (refractive index of air) / (refractive index of glass)

sin(60) / sin(x) = 1 / 1.60

where x is the angle of refraction in the glass.

Solving for x,

x = sin^-1(sin(60) / 1.60)

= sin^-1(1 / 1.60)

= sin^-1(0.625)

=37.51 degree

Therefore, the angle of refraction in the glass is 37.51 degree.

learn more about angle of refraction: https://brainly.com/question/14760207

#SPJ1

Earth's most recent glacial period ended about 11,500 years ago.

The Great Oxygenation Event began about 2.3 billion years ago.

About 160 years ago  carbon dioxide began increasing exponentially to unprecedented levels.

A glacial period is described as an interval of time within an ice age that is marked by colder temperatures and glacier advances.

There are three types of continental glaciers, and they include:

An ice sheet covers an area larger than 50,000 square kilometers. Greenland and Antarctica and are covered by massive ice sheets today.

Learn  more about glaciers at: https://brainly.com/question/6666513

#SPJ1

None of the given options requires work to be done.

Does potential energy require work to be done?

Potential energy is a concept of the energy that results from the object's position; as a concept, it refers to the work you have to do to move the object from U=0.

How is potential energy related to work?

The potential energy U is equal to the work you must do against that force to move an object from the U=0 reference point to the position r. The force you must exert to move it must be equal but oppositely directed, and that is the source of the negative sign.

Does kinetic energy require work?

Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work. After work has been done, energy has been transferred to the object, and the object will be moving with a new constant speed.

Thus, both kinetic and potential energy is not related to work. So, the correct option is D

To know more about potential and kinetic energy :

https://brainly.com/question/16886655

#SPJ4

Rank from largest to smallest, To rank items as equivalent, overlap them is Pd>Pa>Pb>Pc.

What is quantum particles ?

A quantum particle has a complex wave function that is square-integrable and has the form (x1,... xN), where ||2 is the probability density of finding N particles at positions x1,x2,... xN. These places are taken to be inside a square box of size d, with side length L, periodic boundary conditions, and position V.

What is potential energy ?

Potential energy is a form of energy that can be stored but is affected by the way a system's component elements are assembled.  A steel ball is more energetic when it is raised above the ground than when it is lowered.

Therefore, rank from largest to smallest, To rank items as equivalent, overlap them is Pd>Pa>Pb>Pc.

Learn more about quantum particles from the given link.

https://brainly.com/question/29235646

#SPJ4

Given a current loop, find the direction of the magnetic field using the right-hand rule  The magnetic field created by the current loop goes from right to left.

Current travels clockwise (relative to the magnet), so now bend the fingers of your right hand clockwise and point your thumb in the direction of the magnetic field.

This creates a magnetic dipole with the north pole on the left and the south pole on the right.

Now, in a magnet, opposite poles attract and like poles repel, so if we move the magnet towards the loop as shown in the figure, his south pole of the magnet will be repelled by the nearest south pole of the current loop. increase.

A current in a circular loop creates a magnetic field that is more concentrated in the center of the loop than outside it. Stacking multiple loops further concentrates the field in what is called a solenoid.

The magnetic moment m of a current loop is a vector whose magnitude is equal to the area of ​​the loop times the magnitude of the current flowing through it (m = IA) and whose direction is perpendicular to the plane through which the current flows. .

Learn more about bar magnet:

brainly.com/question/24141713

#SPJ4

The radial distance between the 500 VV equipotential surface is 34.2 m, and the 1000 VV surface is 17.1 m .

What is distance ?

Distance is the overall distance that an object actually travels along its course. The displacement of an object between two points is the smallest straight-line distance between those two points, measured from one position to the other. The metric system is used to measure both displacement and distance (m).

What is equipotential surface  ?

When a surface has an equipotential potential, all of its points have the same electric potential. The charge will have the same potential energy at any location along the equipotential surface as a result.

V = k Q / r

(a) 500 V = (9 x 109 ) (1.90 x 10-6 ) / r1

     r1 = 34.2 m

and 1000 = (9 x 109 ) (1.90 x 10-6 ) / r2

  r2 = 17.1 m

distance between them = r1 - r2 = 17.1 m  

(B) for 1500 V

1500 = (9 x 109 ) (1.90 x 10-6 ) / r3

r3 = 11.4 m

distance = r2 - r3 = 5.7 m  

Therefore, radial distance between the 500 VV equipotential surface is 34.2 m, and the 1000 VV surface is 17.1 m .

Learn more about distance from the given link.

https://brainly.com/question/26550516

#SPJ4

Thus, the distance traveled by automobile is [tex]=1.31m[/tex]

The mass of the person is [tex]m=65kg[/tex]

The deceleration of the automobile is [tex]a=30g[/tex]

The acceleration due to gravity is [tex]g=9.81m/s.[/tex]

The initial velocity of the automobile is [tex]v_{i}=100 km/h*\frac{1m/s}{3.6km/h} =27.78m/s[/tex]

Determination of the force exerted on the person:

The force applied to the person can be calculated using Newton's second law as follows:

[tex]F=ma[/tex]

[tex]30g[/tex]Here, m denotes the person's mass, while a denotes the car's acceleration. Because the driver is moving at 30g, the car's acceleration is assumed to be positive.

Substitute the values as 70 kg for [tex]m,(30g)[/tex] for a, and[tex]9.81m/s^{2}[/tex]

for g in the above equation.

[tex]F=70kg*30g[/tex]

   [tex]=70kg*30g*9.81m/s^{2} (\frac{1N}{1kg*m/s^{2} })[/tex]

   [tex]=20,601N[/tex]

Thus, the force acting on the person is [tex]=20,601N[/tex]

Determination of the distance traveled by automobile:

The final velocity of the car can be calculated using Newton's third law and represented as follows:

[tex]v_{f} ^{2}=v_{i} ^{2}+2ad[/tex]

[tex]d=\frac{v_{f} ^{2}=v_{i} ^{2}}{2a}[/tex]

Here [tex]v_{f}[/tex] is the final velocity of the automobile. The final velocity of the automobile becomes 0 m/s as the automobile comes to rest. The acceleration is taken to be negative because the automobile is decelerating at [tex]30g[/tex]

Substitute the values as [tex]0 m/s[/tex] for[tex]v_{f} =27.78m/s[/tex], for[tex]v_{i} ,(-30g)[/tex],  for a, and  [tex]9.81m/s^{2}[/tex]for g in the above equation.

[tex]d=\frac{(0 m/s)^{2} - (27.78m/s)^{2} }{2*(-30)*9.81m/s^{2} }[/tex]

[tex]=1.31m[/tex]

Thus, the distance traveled by automobile is[tex]=1.31m[/tex]

To learn more about sequences refer to:

https://brainly.com/question/14836641

#SPJ9

Answer:

velocity is a hell of a drug treatment classes in the position you are offering to help you with your medical needs and your needs and your needs and your needs and your needs for the future and to be getting your son in a better place for the better of the richest of his family and his life in the world.

Explanation:

no exceptions

The power of the motor in watts is 4000 W.

Power (P) = Work (W) / Time (t)

P = 4000 J / 1 min

P = 4000 J/s

1 J/s = 1 W

P = 4000 W

What is power?

Power is a measure of energy transfer over time. In physics, it is the rate of energy transfer, usually measured in Watts (W) or Joules per second (J/s). Power is the rate at which work is done or energy is converted from one form to another. It can be calculated by multiplying the force applied to an object by the speed at which it moves. Power is related to work, as work is equal to the amount of energy transferred, divided by time. Power is an important concept in physics as it is used to calculate the energy required to perform a task.

Therefore, The power of the motor in watts is 4000 W.

To learn more about power

Here: https://brainly.com/question/27898315

#SPJ1

(a) The equation for the position as a function of time is x (t) = 14 cos(9.9t).

(b) The position of the spring at t = 0.25 s is -11 cm.

The angular speed of the spring is calculated as follows;

ω = √ ( k / m )

where;

ω = √ ( 490 / 5 )

ω = 9.9 rad/s

The equation for the position as a function of time is written as;

x (t) = A cos(ωt)

where;

x (t) = 14 cos(9.9t)

when the time, t = 0.25 s

x (0.25) = 14 cos ( 9.9 x 0.25 )

x (0.25) = -11 cm

Learn more about wave equation here: https://brainly.com/question/25699025

#SPJ1

The gas is undergoing an isothermal process, which is a process in which temperature remains constant. This process involves the gas expanding from a compressed state to a more expanded state.

What is gas?
Gas is a form of energy that is produced through the burning of fossil fuels, such as coal, oil, and natural gas. It is used to power many of the everyday things we use, including our cars, stoves, and furnaces. Gas is also used to generate electricity, as well as provide heat for homes and businesses. When burned, gas creates a number of pollutants, such as carbon dioxide, carbon monoxide, sulfur dioxide, and nitrogen oxides, which can have a negative effect on the environment. To reduce its environmental impact, gas should be used as efficiently as possible. This means using appliances with higher energy ratings and making sure that any maintenance needed is kept up to date. In addition, using renewable energy sources, such as solar and wind power, can help reduce the use of gas.

To learn more about gas
https://brainly.com/question/30117672

#SPJ4

Answer:  proposing the existence of "bridges" through space-time

Sorry if this isn't helpful.

Explanation:

Moving from an area of lower potential to a region of higher potential causes electrons to accelerate. The law of conservation of energy controls the acceleration of the electrons from rest. The final speed can then be determined from the conservation rule by using the electron's speed shortly before it reaches the screen.

The passage of electrons (or other charge carriers) through a conductor in the presence of a potential difference or an electric field is commonly referred to as electricity. There are several interpretations of this flow's pace. While the electrons themselves move far more slowly in common electrical and electronic devices, the signals do so as electromagnetic waves that typically travel between 50% and 99% of the speed of light in a vacuum. For further information, see drift velocity and electron mobility. The speed of an electromagnetic wave flowing along (being steered by) a cable is the pace at which energy or signals go down the wire. In other words, a cable is a type of waveguide. The interaction of the wave with the material(s) inside and around the cable.

learn more about electricity here: https://brainly.com/question/14185315

#SPJ4

the speed and period  of a wave with a wavelength of 2.6 cm in water that is 0.85 cm deep is 28.8 cm/s and 0.09s respectively.

The wavelength, which will also apply to troughs, is the separation between two wave crests. The number of vibrations that pass over a specific place in a second is known as the frequency and is expressed in cycles per second (Hz) (Hertz).

v=[tex]\sqrt{gd}[/tex]

=> [tex]\sqrt{9.8 x 0.0085}[/tex]

=> 0.288m/s => 28.8 cm/s

f, frequency = velocity/wavelength = 1/period

             => 28.8/2.6 = 1/period

Period = 0.09s

A wavelength's frequency and energy (E) drop as it gets longer. These equations show that as the frequency increases, the wavelength decreases. The wavelength lengthens as the frequency drops. The two main categories of waves are electromagnetic and mechanical.

Learn more about wavelength here:

brainly.com/question/15319558

#SPJ4

The resultant displacement of the car can be determined using Pythagorean theorem. The magnitude of car's displacement here is 47.3 Km.

Displacement is a vector quantity measuring the change in position of an object. It can be used in short  term distances. Displacement have both magnitude and direction.

Given , distance to travelled to east = 15 km

to the north = 45 km

then,  the two points if connected will form a triangle where we can use the Pythagorean theorem to find the resultant vector.

The resultant displacement = √(45² + 15 ²) = 47.3 km

Therefore, the displacement of the car is 47.3 km.

Find more on displacement:

https://brainly.com/question/11934397

#SPJ1