Q 1216501479.     A beam of light consists of three wavelengths `4144` Å, `4972` Å and `6216` Å with a total intensity of `3.6 × 10^(-3)` Wm-2 equally distributed among the three wavelengths. The beam falls normally on an area `1.0` `cm^2` of a clean metallic surface of work function `2.3` eV. Assume that there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate the number of photoelectrons emitted in two seconds.

JEE-MIS
A

`1.1 × 10^12`

B

`2.7 × 10^12`

C

`2.7 × 10^10`

D

`1.1 × 10^10`

HINT

`E_1` and `E_2` are greater than the work function `W = 2.3` eV, only first two wavelengths are capable for ejecting photoelectrons. Given intensity is equally distributed in all wavelengths.

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