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A photelectric material having work-func...

A photelectric material having work-function `phi_(0)` is illuminated with light of wavelength `lamda(lamdalt(hc)/(lamda_(0))).` The fastest photoelectron has a de Broglie wevelength `lamda_(d).` A change in wavelength of the incident light by `Deltalamda` results in a change `Deltalamda_(d)` in `lamda_(d).` Then the ratio `Deltalamda_(d)//Deltalamda` is proportional to

A

`(lamda_d^3)/(lamda^2)`

B

`(lamda_d^3)/(lamda)`

C

`(lamda_d^2)/(lamda^2)`

D

`(lamda_d)/(lamda)`

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The correct Answer is:
A
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