question_answer

The stopping potential (in volt) as a function of frequency (v) for a sodium emitter, is shown in the figure. The work function of sodium, from the data plotted in the figure, will be:

(Given : Planck's constantelectron charge )

[JEE Main Held on 12-4-2019 Morning]

A) 1.95 eV

B) 1.82 eV

C) 1.66 eV

D) 2.12 eV

Correct Answer: C

Solution :

[c]

is zero for