Atomic StructureHard

Question

When the light of frequency 2ν0 (where ν0 is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v1  When the frequency of the incident radiation is increased to 5ν0, the maximum velocity of electrons emitted from the same plate is v2. The ratio of v1to v2 is :-

Options

A.

1 : 2

B.

1 : 4

C.

4 : 1

D.

2 : 1

Solution

From Einstein's equation of PEE
12mv12=2hvo-hvo   or 12mv12=hvo..........(1)12mv22=5hvo-hvo   or 12mv22=4hvo..........(2)
(1) ÷ (2)
v1v2=14=12

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