Question

compare velocity of electron in 2nd Orbit of of H with speed of light​

Answer 1

Answer:

The velocity of electron in first orbit of H-atom as compared to the velocity of light is:

 

 

 

 

Medium

Video Explanation

Solution To Question ID 9621

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Answer

Correct option is

B

100

1

​

 

Velocity of light =3×10  

10

 cm/sec.

Velocity of an electron in the orbit is given by the expression, v=  

2πmr

nh

​

,

where, h is Planck's constant =6.6256×10  

−34

 Js.

            m is mass of electron =9.1096×10  

−31

 kg.

            r is radius of orbit =0.529×10  

−10

×n  

2

 m.

For 1  

st

 orbit of H-atom, r=0.529×10  

−10

×1  

2

 m.

Substituting these values in the expression of velocity, we get v=2.18×10  

8

 cm/sec.

Comparing the velocity of the first orbit of H - atom with the velocity of light, we get to know that velocity of the first orbit of H - atom is  

100

1

​

th of the velocity of light.

Explanation: