question_answer

Which of the following transitions in hydrogen atoms emit photons of highest frequency? [AIEEE 2007]

A) n = 2 to n = 6

B) n = 6 to n = 2

C) n =2 to n = 1

D) n = 1 to n = 2

Correct Answer: C

Solution :

[c] Emission spectrum would be found when electron makes a transition from higher energy level to lower energy level.

Frequency of emitted photon is proportional to change in energy of two energy levels, i.e.,

So, emitted energy will be maximum for maximum v and hence, emitted photon has maximum frequency when there is a transition of electron from n=2 to n=1. While in the transition, from n=1 to n=2, energy will be absorbed.