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Q.

The speed of an electron in the inner most orbit of the hydrogen 

(Bohr radius = 52.9 pm;     me = 9.11 × 10–31 kg) is  :
 

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a

 2.19 × 104 m.s–1 

b

2.19 × 106 m.s–1
 

c

2.19 × 107 m.s–1 

d

 2.19 × 108 m.s–1

answer is B.

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Detailed Solution

  • Velocity of an electron in nth Bohr orbit = vn =2.165×106Znms-1
  • First Bohr orbit (n= 1)so Velocity of an electron in1st Bohr orbit = v =2.165×106 ms-1
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