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5% of the energy supplied to a lamp is r...

5% of the energy supplied to a lamp is radiated as a visible light. How many quanta of light are emitted per second by 100 watt lamp ? Assume the average wavelength of visible light at 555 nm

A

`0.7 xx 10^19`

B

`1.4 xx 10^19`

C

`2.1 xx 10^19`

D

`2.8 xx 10^19`.

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