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Wave Optics

Question

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The hydrogen atom is excited from ground state to another state with the principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be

2

3

3

4

Solution

D.

4

Number of spectral lines from a state n to ground state is
$fraction numerator straight n left parenthesis straight n minus 1 right parenthesis over denominator 2 end fraction space equals space fraction numerator 4 left parenthesis straight n minus 1 right parenthesis over denominator 2 end fraction space equals space 6$

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?

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