A particular hydrogen like ion emits radiation of frequency 2.92 × 1015 Hz when it makes transition from n = 3 to n = 1. The frequency in Hz of radiation emitted in transition from n = 2 to n = 1 will be :
(1) 0.44 × 1015
(2) 6.57 × 1015
(3) 4.38 × 1015
(4) 2.46 × 1015