Question

if e=mc² then why does light have no mass
Define briefly ​

Answer 1

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● Since photons (particles of light) have no mass, they must obey E = pc and therefore get all of their energy from their momentum.

● Now there is an interesting additional effect contained in the general equation. If a particle has no mass (m = 0) and is at rest (p = 0), then the total energy is zero (E = 0).

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Answer 2

Answer:

Since photons (particles of light) have no mass, they must obey E =mc and therefore get all of their energy from their momentum. If a particle has no mass (m = 0) and is at rest (p = 0), then the total energy is zero (E = 0).

Explanation: