Question

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