Electron to complete one revolution in orbit of hydrogen, Chemistry

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Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is:

(1) 4 Π mr² / nh

(2) nh/ 4Π² mr

(3) nh/ 4Π ²mr²

(4) h / 2 Π mr

Ans: 4 Π mr ² / nh

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