First slide

Photo Electric Effect

Question

From the given figure, describing photoelectric effect, which of the following can be inferred correctly?

Easy

A

Na and Al both have the same threshold frequency
B

Maximum KE for both the metals depend linearly on the frequency
C

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

Al is better photosensitive material than Na

Solution

$hv = {hv}_{o} + {KE}_{\max}$
$hv = {hv}_{o} + {eV}_{s}$
$V_{s} = \frac{hv}{e} - \frac{{hv}_{o}}{e}$
$v_{o} \to int ercept of x axis$
$If Δv is same {ΔV}_{s} also same$

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