Question

Which of the following transition will emit the maximum energy in a hydrogen atom?

• A. $4f\to 2s$
• B. $4d\to 2p$
• C. $4p\to 2s$
• D. All have same energy

Answer 1

The correct option is D All have same energy

Energy of all (s, p, d, f) subshells present in the same orbit in a hydrogen atom have same energy because they are degenerate orbitals.
So, energy emission in $4f\to 2s$, $4d\to 2p$, $4p\to 2s$ transitions have same energy because these transition are from orbit 4 to orbit 2.