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Two separate monochromatic light beams A...

Two separate monochromatic light beams `A` and `B` of the same intensity (energy per unit area per unit time) are falling normally on a unit area of a metallic surface. Their wavelength are `lambda_(A)` and `lambda_(B)` respectively. Assuming that all the the incident light is used in ejecting the photoelectrons, the ratio of the number of photoelectrons from beam `A` to that from `B` is

A

`((lambda_(A))/(lambda_(B)))`

B

`((lambda_(B))/(lambda_(A)))`

C

`((lambda_(B))/(lambda_(A)))^(2)`

D

`((lambda_(A))/(lambda_(B)))^(2)`

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The correct Answer is:
A
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