The effective mass of photon in microwave region, visible region and x -ray region is in the following order:

Microwave > X-rays > Visible

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X-rays > Microwave > Visible

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Microwave > Visible> X-ray

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X-rays > Visible > Microwave

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Solution

The correct option is B X-rays > Visible > Microwave
Relation between wavelength and mass is given as $λ = \frac{h}{m v}$
Since h and v are constant, higher the wavelength less the mass wavelength of x ray is least followed by visible ray and then microwave.
So effective mass of photon follows $X - r a y s > V i s i b l e > M i c r o w a v e$
So, the answer is option (D).

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