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Question

The de Broglie wavelength of an electron in the 4th Bohr orbit is:

A
6πa0
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B
4πa0
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C
2πa0
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D
8πa0
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Solution

The correct option is D 8πa0
de Broglie wavelength (λ)
2πr=nλ
n is integer
r raduis of orbit
Z is atomic number
n=4 & r=a0n2Z2πa0n2z=nλ
2π42a11=4λ
λ=8πa0

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