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Wave Optics

Question
CBSEENPH12039849
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An electron of a stationary hydrogen atom passes from the fifth energy level to ground level. The velocity that the atom acquired as a result of photon emission will be

  • fraction numerator 24 hR over denominator 25 space straight m end fraction
  • fraction numerator 25 hR over denominator 24 space straight m end fraction
  • fraction numerator 25 space straight m over denominator 24 space hR end fraction
  • fraction numerator 24 space straight m over denominator 25 space straight h space straight R end fraction

Solution

A.

fraction numerator 24 hR over denominator 25 space straight m end fraction Here comma space straight E subscript 5 space minus straight E subscript 1 space equals space hc over straight lambda and space fraction numerator straight R space hc over denominator 25 end fraction space equals space straight R space hc space equals space hc over straight lambda 24 over 25 straight R space equals space 1 over straight lambda space straight P space equals straight h over straight lambda straight v equals straight h over mλ space equals space 24 over 25 Rh over straight m

Some More Questions From Wave Optics Chapter

Answer the following questions, which help you understand the difference between Thomson's model and Rutherford's model better.
Is the probability of backward scattering (i.e., scattering of α-particles at angles greater than 90°) predicted by Thomson's model much less, about the same, or much greater than that predicted by Rutherford's model?

Answer the following questions, which help you understand the difference between Thomson's model and Rutherford's model better.
Keeping other factors fixed, it is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?

Answer the following questions, which help you understand the difference between Thomson's model and Rutherford's model better.
In which model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of α-particles by a thin foil?

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