Question #2363c

1 Answer
Eddie
May 7, 2017

The photon has zero rest mass (m_o), it travels at the speed of light in every reference frame.

But in terms of its relativistic energy E^2 = p^2 c^2 + m_o^2c^4, then m_o = 0 implies E = pc. So the photon has relativistic momentum and mass.

https://en.wikipedia.org/wiki/Solar_sail

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