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Question

The rest mass of a photon of wavelength λ is

A
Zero
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B
hλ
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C
λh
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D
hcλ
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Solution

The correct option is B Zero
The correct general equation is E2=m2c4+p2c2
m is the rest mass, the one you'd observe if you were in the same reference frame. A photon has no reference frame; it has zero rest mass.

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