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Q.

Find out the number of waves made by a Bohr electron in one complete revolution in it's 3rdorbit.

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answer is 3.

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Detailed Solution

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Velocity of the electron in 3rd orbit =3h​/2πmr

where, m= mass of electron and r= radius of 3rd orbit.

Applying de Broglie equation,

Number of waves =2πr​/λ=2πr/2πr​×3=3.

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