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Photons of wavelength 600 nm are emitted...

Photons of wavelength 600 nm are emitted from a 60 watt lamp. What is the number of photons emitted per second ? Take `h = 6.6 xx 10^-34 Js`

A

`2 xx 10^16`

B

`2 xx 10^18`

C

`2 xx 10^20`

D

`2 xx 10^22`.

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