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The number of Photons of wavelength 660 ...

The number of Photons of wavelength 660 nm emitted per second by an electric bulb of 60 W is .....
(Take `h= 6.6 xx 10^(-34) Js` )

A

`2 xx 10^(-20)`

B

`2 xx 10^(20)`

C

`3 xx 10^(20)`

D

`1.5 xx 10^(20)`

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