Q .     Monochromatic light of wavelength `3000` Å is incident on a surface area `4` `cm^2`. If intensity of light is `150` `mW//m^2`, then rate at which photons strike the target is

BITSAT 2007
A

`3 × 10^10` photons/sec

B

`9 × 10^13` photons/sec

C

`7 xx 10^15` photons/sec

D

`6 xx 10 ^19` photons/sec

HINT

`n /t = (IA lamda)/(hc)`
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