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The Photon Model

According to ...

Question

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

Energy and momentum

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Speed and momentum

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Speed only

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Energy only

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Solution

The correct option is C
Speed only

Speed of photon is $3 \times 10^{8} m / s$ in vacuum.

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