Q.

Two electrons are revolving around a nucleus at distances r and 4r. What will be the ratio of their periods?

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answer is 2.

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Detailed Solution

T∝n3  and  r∝n2     ..........(1)⇒T2∝n6⇒T2∝n23 From eq. (1) T2∝r3⇒TrT4r=r4r3/2=18
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