In a hydrogen atom, spectral lines are emitted when electrons radiate energy. This happensbecause of theI. change in its orbital motion.II. weak nuclear attractive force.III. jumping from higher to a lower energy level
Correct answer: B. III only
- A. I only
- B. III only
- C. I and II
- D. II and III
Explanation
The correct answer is III only. Spectral lines are emitted when electrons in a hydrogen atom transition from a higher energy level to a lower one, releasing energy in the form of light. Option I is incorrect because changes in orbital motion alone do not explain the emission of spectral lines. Option II is incorrect because the weak nuclear attractive force does not directly cause spectral line emission; instead, it is the electron transitions between energy levels that are responsible.
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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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