Topic Question Set
Q 21
:
The work function of metal is 3 eV. The colour of the visible light that is required to cause emission of photoelectrons is [2025]
Green
Blue
Red
Yellow
(2)
For emission :
Q 22
:
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A) : In photoelectric effect, on increasing the intensity of incident light the stopping potential increases.
Reason (R) : Increase in intensity of light increases the rate of photoelectrons emitted, provided the frequency of incident light is greater than threshold frequency.
In the light of the above statements, chose the correct answer from the options given below: {2025]
Both (A) and (R) true but (R) is NOT the correct explanation of (A).
(A) i false but (R) is true.
(A) is true but (R) is fale.
Both (A) and (R) true and (R) is the correct explanation of (A).
(2)
Stoppint potential, so stopping potential doesn't depend on intensity, stopping potential depends on frequency.
Intensity number of photons.
On increasing intensity, no. of photons per sec increases and so the no. of electrons.
