In equation $P=Ec^{-1}$, where P is mome

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Target Exam

CUET

Subject

Physics

Chapter

Nuclei

Question:

In equation $P=Ec^{-1}$, where P is momentum, E is energy and c is the speed of light. In which of the following options, this equation is valid:

Options:

for an electron only

for a photon but not for an electron

for an electron as well as for a photon

neither for an electron nor for a photon

Correct Answer:

for a photon but not for an electron

Explanation:

The correct answer is Option (2) → for a photon but not for an electron $n^{2}$

The equation $P=Ec^{-1}$ is valid for mass less particles. Such as photons, where the energy and momentum is related by $E=Pc$.