According to Bohr’s principle, the relation between the principal quantum number (n) and the radius of the orbit (r) is

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r is proportional to 1n

r is proportional to 1n2

r is proportional to n

r is proportional to n2

answer is D.

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Detailed Solution

From Bohr's postulates mvr=nh2π and mv2r=14πε0e2r2 solving for r we get r proportional to n2

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