Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon ?

Options

A. 3 s
B. `2p`
C. 2s
D. 1 s

Answer

D

Explanation

When electron jumps to lower orbit photons are emitted while photons are absorbed when electron jumps to higher orbit. 1s-orbital is the lower most, electron in this orbital can absorb photons but cannot emit.