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If 5% of the energy supplied to a bulb i...

If 5% of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per second by a 100 W lamp? Assume wavelength of visible light as `5.6xx10^(-5)` cm.

A

`1.4 xx 10^(19)`

B

`2.0 xx 10^(-4)`

C

`1.4 xx 10^(-19)`

D

`2.0 xx 10^(4)`

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The correct Answer is:
A
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