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(C) According to Bohr's postulate,the angular momentum of an electron is quantized as $mvr = \frac{nh}{2\pi}$.According to De Broglie's hypothesis,$\l

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$3$

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(C) According to Bohr's postulate,the angular momentum of an electron is quantized as $mvr = \frac{nh}{2\pi}$.According to De Broglie's hypothesis,$\lambda = \frac{h}{mv}$,which implies $mv = \frac{h}{\lambda}$.Substituting this into the Bohr's postulate: $(\frac{h}{\lambda})r = \frac{nh}{2\pi}$.This simplifies to $2\pi r = n\lambda$,where $n$ is the principal quantum number.For the $3^{rd}$ orbit,$n = 3$,so the number of waves is $3$.

Number of waves made by Bohr's electron in one complete revolution in the $3^{rd}$ orbit.

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