Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is ______ × 1013 Hz (nearest integer). [Given : RH (Rydberg constant) = 2.18 × 10-18 J, h (Planck's constant) = 6.6 × 10-34 J.s.]
λ = h/mv
λ · v = h/m
(λ · v²)/v = h/m
v²/Frequency = h/m
Frequency = mv²/h = 2RH/h = (2 × 2.18 × 10-18)/(6.6 × 10-34) = 660.6 × 1013 Hz
Nearest integer = 661
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