1.

Assertion : Rayleigh scattering can be considered as elastic collisions of photons with massive particles. Reason: In Rayleigh scattering, the energy of incident and scattered is same (1) If both assertion and reason are true and reason is the correct explanation of assertion. (2) If both assertion and reason are true but reason is not the correct explanation of assertion. (3) If assertion is true but reason is false. (4) If both assertion and reason are false.

Answer»

Correct option (1) If both assertion and reason are true and reason is the correct explanation of assertion.

Explanation:

In Rayleigh scattering, when a photon (of momentum P) collide with a very massive particles (of mass m) (distant particles,…… etc.) then the momentum transferred will be P or 2P so energy transferred is  P2/2m or (P2)/2m which will be very small.



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