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A laser beam of output power P consists ...

A laser beam of output power `P` consists only of wavelength `lambda`. If Planck's constant is `h` and the speed of light is `c`, then the number of photons emitted per second is

A

`P lambda // hc`

B

`P lambda // h`

C

`hc // p lambda`

D

`hc//p`

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The correct Answer is:
A
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