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According to Bohr's atomic model, the angular momentum of an electron in the 5th orbit is expressed as x/pi. Find the value of x.

1. 5h
2. 5h/2
3. 5h/pi
4. h/5

Correct answer: 5h/2

Solution

By Bohr's postulate, Lₙ = n*h/(2*pi). For n = 5, L = 5h/(2*pi) = (5h/2)/pi, so x = 5h/2.

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