A particle which has zero rest mass and non-z | vedclass

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Question

(A) According to the theory of relativity,the energy $E$ and momentum $p$ of a particle are related to its rest mass $m_0$ by the equation $E^2 = (pc)

Vedclass · Accepted Answer

Equal to $c$,the speed of light in vacuum

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(A) According to the theory of relativity,the energy $E$ and momentum $p$ of a particle are related to its rest mass $m_0$ by the equation $E^2 = (pc)^2 + (m_0c^2)^2$.For a particle with zero rest mass $(m_0 = 0)$,the equation simplifies to $E = pc$.Since $p = mv$ and $E = mc^2$ (where $m$ is the relativistic mass),we have $mc^2 = mvc$,which implies $v = c$.Therefore,any particle with zero rest mass,such as a photon,must travel at the speed of light $c$ in a vacuum.

$A$ particle which has zero rest mass and non-zero energy and momentum must travel with a speed

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