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What will be the number of photons emitt...

What will be the number of photons emitted per second by a 10 w sodium vapour lamp assuming that `90%` of the consumed energy is converted into light ? ( wavelength of sodium light is 590 nm, h = ` 6.63 xx 10^(-34) Js`)

A

`0.267 xx 10^(18)`

B

`0.267 xx 10^(19)`

C

`67 xx 10^(19)`

D

`0.267 xx 10^(17)`

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The correct Answer is:
C
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