Which of the following is true when Bohr gave his model for hydrogen atom?

Easy

A

It was not known that hydrogen lines could be explained as differences of terms like $R / n^{2}$ with R being a constant and n an integer.
B

It was not known that positive charge is concentrated in a nucleus of small size.
C

It was not known that radiant energy occurred in energy bundles defined by hv with h being a constant and v a frequency.
D

Bohr knew terms like $R / n^{2}$ and in the process of choosing allowed the orbits to fit them, he got angular momentum $= n h / 2 π$ as a deduction.

Solution

a. No, since Balmer formula was known.
b. No, since Rutherford scattering experiment was known.
c. No, since Einstein's photon theory was known.
d. Bohr chose 'allowed' energy levels $\propto 1 / n^{2}$ and these led to angular momentum quantized as a derivation.

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