Question

Which of the following transitions in a hydrogen atom emits photon of the highest frequency.

• A. n = 1 to n = 2
• B. n = 2 to n = 1
• C. n = 2 to n = 6
• D. n = 6 to n = 2

Answer 1

Answer: (A)

n = 1 to n = 2

Answer 2

$\mathbf{\because}\mathbf{E}_{\mathbf{1}}\mathbf{>}\mathbf{E}_{\mathbf{2}}$

$\mathbf{\therefore}\mathbf{\nu}_{\mathbf{1}}\mathbf{>}\mathbf{\nu}_{\mathbf{2}}$

i.e. photons of higher frequency will be emitted if transition takes place from n = 2 to 1.