1) फोटॉन के गतिक द्रव्यमान का सूत्र है-
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According to electromagnetic theory, the rest mass of photon in free space is zero and also photon has non-zero rest mass, as well as wavelength-dependent. The very recent experiment revealed its non-zero value as 10 - 54 kg ( 5.610 × 10 - 25 MeV c - 2 ) .
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