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

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

IIT JEEIIT JEE 1984Structure of Atom

Solution:

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.