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Wave Optics
Question
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Is Bohr's atomic theory applicable only for hydrogen atom?

Answer

No, Bohr's atomic theory is applicable for all single elctron atoms like He+, Li2+ etc. 
In Bohr's theory we assume that centripetal force is provided by the electrostatic force of attraction by the nucleus. 

In multiple elctron atoms, there will also be repulsion due to other electrons present in the nucleus. 

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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?