First slide

Photoelectric effect and study of photoelectric effect

Question

From the figure describing photoelectric effect, we may infer correctly that

Moderate

A

Na and Al both have the same threshold frequency.
B

Maximum kinetic energy for both the metals depend linearly on the frequency.
C

The stopping potentials are different for Na and Al for the same change in frequency.
D

Al is a better photosensitive material than Na.

Solution

Stopping potential equals to maximum kinetic energy. Since stopping potential is varying linearly with the frequency, max. KE for both the metals also vary linearly with frequency.
$V_{0} = \frac{h ν}{e} - \frac{W_{0}}{e} a n d K_{m a x} = e V_{0}$

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