Question

In 12th orbit of H-atom, mv12r12 = ?

Answer 1

Explanation:

According to Bohr's second postulate, mvr=

2π

nh

where m be the mass of an electron, v be the velocity and r be the radius of orbit in which the electron revolves around the nucleus.

So, v=

2πmr

nh

Here, the centripetal force is provided by the electrostatic force of attraction between electron and nucleus.

Thus,

r

mv

2

=

r

2

k(Ze)(e)

⇒r=

mv

2

kZe

2

Substituting the value of v:

r=

4π

2

mkZe

2

n

2

h

2

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