# What affects number of photoelectrons emitted?

## What affects number of photoelectrons emitted?

So, the number of electrons emitted is only proportional to the intensity of the light not the energy (or frequency) as long as the energy of the photons is higher then the work function of the metal. I correct. Frequency does affect the number of photoelectrons coming out from the surface.

How do you know how many photoelectrons emitted?

According to the equation E=n⋅h⋅ν (energy = number of photons times Planck’s constant times the frequency), if you divide the energy by Planck’s constant, you should get photons per second.

What is meant by photoelectric emission?

The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons.

### Which determines the number of electrons emitted by a photoelectric material?

Each packet or photon could cause one electron to be ejected, which is like having a moving particle collide with and transfer energy to a stationary particle. The number of electrons ejected therefore depends upon the number of photons, i.e. the intensity of the light.

What happens to the frequency of emitted photoelectrons if intensity of light increases?

The kinetic energy of emitted photoelectrons should increase with the light amplitude. The rate of electron emission, which is proportional to the measured electric current, should increase as the light frequency is increased.

What will increase the number of electrons emitted in terms of the photoelectric effect?

According to Planck’s quantum concept, intensity of incident beam (electromagnetic wave) means, the number of photons in beam. If intensity of beam increases, number of photons increases, hence the number of photo-electrons emitting will increase, in accordance with the laws of photoelectric emission.

#### How many photons are emitted per second from the sun?

If we use the 1e45 figure for photons/sec emitted by the Sun, then you get ~1.8e36 photons striking the Earth per sec and 4.4e16 photons per sec hitting the eye (assuming a pupil diameter of 2mm.)

How many photons are emitted per second by a 60 watt bulb?

8×10−19.

Why are photoelectrons emitted?

When light shines on a metal, electrons can be ejected from the surface of the metal in a phenomenon known as the photoelectric effect. This process is also often referred to as photoemission, and the electrons that are ejected from the metal are called photoelectrons.

## How is the emission of photoelectrons produced?

The photoelectric effect occurs when green light strikes the metallic surface and photoelectrons are emitted. The photoelectric effect also occurs when blue light strikes the metallic surface. However, the kinetic energies of the emitted photoelectrons are much higher for blue light than for green light.

When the intensity of the light increased the number of electrons emitted?

The maximum kinetic energy of the emitted electron increases as the frequency of the incident light increases. 2. The number of electrons emitted is proportional to the intensity of the incident light.

What is the relationship between the maximum kinetic energy of the emitted photoelectrons and intensity of the incident light?

The maximum kinetic energy of the photoelectrons is found to increase with the increase in the frequency of incident light when the frequency of incident radiation (f > fTh) exceeds the threshold limit. Hence, option 1 is correct. The maximum kinetic energy is independent of the intensity of light.

### How does the number of electrons emitted can be increased?

Frequency of incident radiation increases the emergy/maximum speed of ejected photo electron. The number of electrons is increased by increasing the intensity of incident radiation.

How many photons second are emitted by a 100 watt light bulb?

If, for instance, you are calculating all the photons emitted by a 100-watt bulb: 100 / (3.06 x 10^-19) = 3.27 x 10^20. This is the number of photons that the light carries each second.

How many photons are emitted from a light bulb?

So, in order to emit 60 Joules per second, the lightbulb must emit 1.8 x 1020 photons per second. (that’s 180,000,000,000,000,000,000 photons per second!)

#### How many photons are emitted per second?

Thus the number of photons emitted per second =3. 14×105×10=1.

Why do emitted electrons have a maximum value?

There is a certain maximum because if you imagine the electrons at the surface, the least amount of energy is required to release such electrons from the metal surface however electrons deeper within the metal will require more energy in order to escape the metallic structure.

Why are photoelectrons emitted instantaneously?

According to quantum mechanics The energy is transmitted by photon to electrons by the collision between the two. Only those photons can eject electrons which have energy more than or equal to a minimum required energy (threshold energy). Since energy is transferred in a lump, the ejection is instantaneous.

## How is the intensity of light related to the number of electrons and the frequency of the light is related to the kinetic energy of electrons?

When a photoelectric effect is observed, the number of electrons ejected is proportional to the intensity of the incident light. However, the maximum kinetic energy (KEMAX) of the photoelectrons is independent of the light intensity.

• October 1, 2022