If the speed of electron in the first Bohr O orbit of radius 0.5 A is 2.24 x 106 m/s, then the period of revolution of the electron in this orbit is, (a) 1.403 × 10-16 S (b) 2.403 x 10-16 S (c) 1.403 × 10-¹1 S (d) 2.403 x 10-¹1 S
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