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MHT CET Physics question

PhysicsAtomsMHT CET

A hydrogen atom moves with a velocity u and makes a head-on inelastic collision with another stationary hydrogen atom. Both atoms are in the ground state before collision. The minimum value of u if one of them is to be given a minimum excitation energy is

Answer: (A)

Solution

In a perfectly inelastic collision the kinetic energy lost is , which must equal the minimum excitation energy 10.2 eV, so

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Question ID VK-084812