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Q.

The ratio of the velocity of light and the velocity of electron in the first orbit of  a hydrogen atomGiven  h=6.624 × 10−27 erg−sec;  m=9.108 × 10−28 g,  r=0.529 × 10−8cm.

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a

137

b

1137

c

113700

d

13700

answer is A.

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Detailed Solution

v=h2πm (or) Vn=2.18×108×Zncm/sec=6.624  ×  10−272 ×  3.14 ×  9.108 ×  10−28×  0.529 ×  10−8 =2.189 ×  108 cm/seccv = 3 ×  10−102.189  ×  108=137
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