If the frequency required for the transition from 2nd to 5th orbit is 4 x \( { 10}^{ 15} \) Hz, what will the corresponding energy be?

26.5 eV 16.5 eV 26.5 J 16.5 J

16.5 eV

energy : E = hv v = 4 x \( { 10}^{ 15} \) Hz $ E = 6.63\times 10^{-34}\times 4\times 10^{15} J = 16.5 eV$