time taken for an electron to complete one
Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is:
(1) 4 Π mr 2 / nh
(2) nh/ 4Π2 mr
(3) nh/ 4Π 2mr2
(4) h / 2 Π mr
Ans: 4 Π mr 2 / nh
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