Asked by stephan

Why do light(photons) have no mass

Answers

Answered by Damon
Their rest mass has to be zero or it would be infinite at their speed, which of course is the speed of light :)
mass = rest mass/sqrt(1-beta^2)
where beta = v/c
if v is c, then the denominator approaches zero and if there is finite rest mass the fraction --->oo
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