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A 100 watt bulb emits monochromatic ligh...

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

A

`20.12 xx 10^(20) S^(-1)`

B

`2.012 xx 10^(20) S^(-1)`

C

`4.969 xx 10^(-19) S^(-1)`

D

`49.69 xx 10^(-19) S^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`E = (Nhc)/(lambda) rArr N =(E lambda)/(hc )`
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