Q.
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a
It was not known that hydrogen lines could be explained as differences of terms like R/n2 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/n2 and in the process of choosing allowed the orbits to fit them, he got angular momentum=nh/2π as a deduction.
answer is D.
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