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The work functions of metals A and B are...

The work functions of metals `A` and `B` are in the ratio `1 : 2`. If light of frequencies `f` and `2 f` are incident on the surfaces of `A` and `B` respectively , the ratio of the maximum kinetic energy of photoelectrons emitted is ( `f` is greater than threshold frequency of `A , 2f` is greater than threshold frequency of `B`)

A

`1:1`

B

`1:2`

C

`1:3`

D

`1:4`

Text Solution

Verified by Experts

The correct Answer is:
B
`(KE_(1))/(KE_(2))=(E_(1)-W_(1))/(E_(2)-W_(2))=(hv_(1)-w_(1))/(hv_(2)-w_(2))=(hf-w)/(2hf-2w)=1/2`
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