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Question

If the radius of the first Bohr orbit of hydrogen atom is 0.53 Å, the radius of the third orbit of a hydrogen atom is .

A
4.77 Å
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B
1.59 Å
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C
2.12 Å
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Solution

The correct option is A 4.77 Å

Try to recall the formula for radius of nth orbit from Bohr's postulates.

rn = r1 (n2)

= r1 (32) Where r1 is the radius corresponding to the ground-state n=1

= 0.53 × 9 = 4.77 Å


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