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A beam of light has three lambda, 4144 "...

A beam of light has three `lambda, 4144 "Å", 4972 "Å" "and"6216 "Å"` with a total intensity of `3.6 xx10^(-3) Wm^(-2)` equally distributed amongst the three `lambda.` The beam falls normally on an area `1.0 cm^(2)` of a cleam metallic surface of work function 2.3 eV. Assume that there is no loss of light by reflection etc. Calculate the no. of photoelectrons emitted in 2 sec, in scientific notation,`x xx 10^(y)` find the value of y.

A

`2xx10^(9)`

B

`1.075 xx 10^(12)`

C

`9xx10^(8)`

D

`3.75 xx 10^(6)`

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The correct Answer is:
B
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