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I vs V - Varying Frequency

In photoelect...

Question

In photoelectric effect, the K.E. of electrons emitted from the metal surface depends upon

A

Intensity of light

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B

Frequency of incident light

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C

Velocity of incident light

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D

Both intensity and velocity of light

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Solution

The correct option is B
Frequency of incident light

If frequency of incident light increases, kinetic energy of photoelectron also increases.

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Similar questions

Q. In the photoelectric effect (for a given target and a given frequency of the incident light), which of these quantities depend on the intensity of the incident light beam?

When a high frequency electromagnetic radiation is incident on a metallic surface, electrons are emitted from the surface. Energy of emitted photoelectrons depends only on the frequency of incident electromagnetic radiation and the number of emitted electrons depends only on the intensity of incident light.

Einstein's photoelectric equation

[K_{m a x} = h ν - ϕ]

correctly explains the PE, where

ν =

frequency of incident light and

ϕ =

The slope of the graph shown in fig. [here h is the Planck's constant and e is the charge of an electron] is

Q. When light of sufficiently high frequency is incident on a metallic surface, electrons are emitted from the metallic surface. This phenomenon is called photoelectric emission. Kinetic energy of the emitted photoelectrons depends on the wavelength of incident light and is independent of the intensity of light. Number of emitted photoelectrons depends on intensity.

(h ν - ϕ)

is the maximum kinetic energy of emitted photoelectrons (where

ϕ

is the work function of metallic surface). Reverse effect of photo emission produces X-ray. X-ray is not deflected by electric and magnetic fields. Wavelength of a continuous X-ray depends on potential difference across the tube. Wavelength of characteristic X-ray depends on the atomic number. If potential difference across the tube is increased then:

Q. Light of particular frequency v is incident on a metal surface. When the intensity of incident radiation is increased, the photoelectric current

Q. Assertion : Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon.

Reason : The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

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