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Q)

How many times does light travel faster in vaccum than an electron in Bohr first orbit of hydrogen atom?

$(a)\;13.7 times\qquad(b)\;67 times\qquad(c)\;137 times\qquad(d)\;97 times$

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A)
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$V = \large\frac{Z}{n}\times2.88\times10^8$ cm/S
$V_1 = \large\frac{1}{1}\times2.88\times10^8$ cm/S
$\large\frac{Velocity \;of\; light}{Velocity \;of \;electron} = \large\frac{3\times10^{10}}{2.188\times10^8}$
=137 times
Hence answer is (c)
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