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Question

If a source of power 4 kW produces 1026 photons/second, the radiation belongs to a part of the spectrum called:

A
X-rays
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B
Ultraviolet rays
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C
Microwaves
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D
γ-rays
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Solution

The correct option is C Microwaves
4000 J of energy is produced from 1026 photons in one second.
Energy of each photon E=40001026=4×1023 J
Frequency of each photon ν=Eh=4×10236.63×1034=6×1010 Hz
So the radiation belongs to micro waves.
Correct answer is option C.

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