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A point source of constant power P is em...

A point source of constant power P is emitting photon of wavelength `lambda`. What is the intensity of photons at r distance from the source ?(speed of light = c)

A

`(Plambda)/(2pi r^2hc)`

B

`(Plambda)/(4pi r^2hc)`

C

`(Plambda)/(hc)`

D

`(Plambda)/(r^2hc)`

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