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Matter Waves

A 160 watt in...

Question

A 160 watt infrared source is radiating light of wavelength 50000Å uniformly in all directions. The photon flux at a distance of 1.8m is of the order of

A

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B

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C

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D

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Solution

The correct option is D
$N = \frac{I λ}{h c} = \frac{P λ}{(4 π R^{2}) h c}$

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