According to Bohr's model, an electron in a hydrogen atom radiates energy when it
Correct answer: B. jumps from a higher energy level to a lower one
- A. moves in a stable orbit
- B. jumps from a higher energy level to a lower one
- C. jumps from a lower energy level to a higher one
- D. is at rest in the nucleus
Explanation
Bohr postulated that an electron in an allowed orbit does not radiate at all, contradicting classical electromagnetism, and that a photon is emitted only when it drops to a lower level, carrying exactly the energy difference. Absorbing a photon does the reverse and lifts the electron to a higher level. This is why emission and absorption spectra of an element show lines at the same wavelengths.
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About Atomic Spectra
Atoms emit or absorb light at specific wavelengths because electrons occupy quantized energy levels and change levels by absorbing or releasing photons. The topic covers emission and absorption spectra, spectral series, hydrogen’s line spectrum, energy-level transitions, and the relation between wavelength, frequency and photon energy.
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