# The time period of revolution of electron in its ground state orbit in a hydrogen atom is 1.6 × 10–16 s.

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The time period of revolution of electron in its ground state orbit in a hydrogen atom is 1.6 × 10–16 s. The frequency of revolution of the electron in its first excited state (in s–1) is:

(1) 6.2 × 1015

(2) 5.6 × 1012

(3) 7.8 × 1014

(4) 1.6 × 1014

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