If the radius of the 1st orbit of hydrogen is 'r', then the radius of the 3rd orbit of hydrogen is ________.

If the radius of the 1st orbit of hydrogen is 'r', then the radius of

1.	If the radius of the 1st orbit of hydrogen is 'r', then the radius of the 3rd orbit of hydrogen is ________.
A.	9r
B.	r1 / 3
C.	3r
D.	r3
Answer» B. r1 / 3

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If the radius of the 1st orbit of hydrogen is 'r', then the radius of the 3rd orbit of hydrogen is ________.

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