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When a hydrogen atom is raised from the ground state to an excited state,

1. P.E decreases and K.E increases
2. P.E increases and K.E decreases
3. both K.E. and P.E. decrease
4. absorption spectrum

Correct answer: P.E increases and K.E decreases

Solution

When a hydrogen atom transitions to an excited state, the electron moves to a higher energy level. The potential energy (P.E.) increases due to the increased separation from the nucleus, while the kinetic energy (K.E.) decreases as the electron's speed reduces in the higher orbit.

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