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Q.

Whenever a stream of electrons collides with a stream of photons, in this collision, which of the following is not conserved ?

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a

Linear momentum

b

No. of photons

c

Total energy

d

No. of electrons

answer is C.

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Detailed Solution

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In a photon-particle collision (such as photon-electron), the total energy and total momentum are conserved. However, the number of photons may not be conserved in a collision. The photon may be absorbed, or a new photon may be created.

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