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Question

What is the mass of photon in motion?


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Solution

Step 1: Write the expression of energy of photon having plank constant hand frequency f.

E=hf

Write the expression for Einstein's mass energy equivalence is

E=mc2

Here,m is mass of photon and c speed of photon.

Step 2: Substitute mc2 for E in the expression of energy of photon.

mc2=hfm=hfc2

Hence, mass of photon is hfc2.


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