1.

The graph shows variation of stopping potential V0 versus frequency of incident radiation ν for two photosensitive metals A and B. Which of the two metals has higher threshold frequency and why?

Answer»

Metal A has higher threshold frequency, 

We know that for a given photosensitive material, 

The stopping potential varies linearly with the frequency of the incident radiation. 

Also, 

Work function,

φ0 = hv0 

Also, 

φ0 = e × magnitude of intercept on potential axis. 

Here for metal A, 

y – intercept is more negative for metal A.



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