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AP EAMCET201822 Apr 2018Evening ShiftPhysicsAtomic PhysicsActual

A stationary hydrogen atom undergoes a transition from n=5 to n=4 . Recoil speed of the atom is (R= Rydberg constant, h= Planck's constant and m= mass of the proton).

Options

  1. AR h m
  2. B9 m 400 R h
  3. C9 R h 400 m
  4. D7 R h 400

Correct answer

C. 9 R h 400 m

Step-by-step solution

For transition 5 4 , Momentum of photon, p= h =h R ( 1 16 - 1 25 ) and recoil speed, v= p m = h R ( 1 16 - 1 25 ) m = 9 h R 400 m

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