The maximum velocity of electrons emitted from a metal surface is v. What would be the maximum velocity if the frequency of incident light is increased by a factor of 4?
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a
2v
b
>2v
c
<2v
d
between 2v and 4v
answer is B.
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Detailed Solution
12mv2=hv−ϕ012mv′2=4hv−ϕ0v′2v2=4hv−ϕ0hv−ϕ0 or v′2v2=4[hv−ϕ]+3ϕ0hv−ϕ0 Clearly, v′>2v
The maximum velocity of electrons emitted from a metal surface is v. What would be the maximum velocity if the frequency of incident light is increased by a factor of 4?