According to photon theory of light which of the following physical qu – McqOptions

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1.	According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum [AMU (Engg.) 2001]
A.	Energy and momentum
B.	Speed and momentum
C.	Speed only
D.	Energy only
Answer» D. Energy only

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