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Standard XII

Physics

The Experimental Setup

The electrons...

Question

The electrons are emitted in the photo electric effect from a metal surface :

Only if the temperature of the surface is high.

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With a maximum velocity proportional to the frequency of the incident radiation.

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Only if the frequency of the incident radiation is above a certain threshold value.

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At a rate that is independent of the nature of the metal.

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Solution

The correct option is B Only if the frequency of the incident radiation is above a certain threshold value.
Only if the frequency of the incident radiation is above a certain threshold value.

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Similar questions

Q. The electrons are emitted in the photoelectric effect from a metal surface

Only if the frequency of the incident radiation is above a certain threshold value

Only if the temperature of the surface is high

In photoelectric effect, electrons are emitted

(1) At a rate that is independent of emitter.

(2) At a rate that is proportional to the square of amplitude of incident radiation

(3) With a maximum velocity proportional to the frequency of incident radiation

(4) Only if frequency of the incident radiation is above a threshold value

Note: Please explain all the options...

Q. The threshold frequency for a certain metal is

v_{0}

when a certain radiation of frequency 2

v_{0}

incident on this metal surface maximum velocity of photo electrons emitted is

2 \times 10^{6}

m/s, if radiation of frequency 3

v_{0}

is incident on the same metal surface, the maximum velocity of the photo electrons emitted (in m/s ) is :

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 =

work function.

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. The threshold frequency for certain metal is

ν_{0} .

When light of frequency

2 ν_{0}

is incident on it the maximum velocity of photo electrons is

4 \times 10^{6} {ms}^{- 1} .

If the frequency of incident radiation is increased to

4 ν_{0}

, then the maximum velocity of photo electrons will be-

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The electrons are emitted in the photo electric effect from a metal surface :

The correct option is B Only if the frequency of the incident radiation is above a certain threshold value.Only if the frequency of the incident radiation is above a certain threshold value.

The correct option is B Only if the frequency of the incident radiation is above a certain threshold value.
Only if the frequency of the incident radiation is above a certain threshold value.