The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to

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Q: The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings)

(a) 2πhc/e2

(b) e2h/2πc

(c) e2c/2πh

(d) 2πe2/hc

Ans: (c)

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