The characteristic X-rays spectrum is due to_____________?
Correct answer: C. The bombardment of target by electrons
- A. The illumination of the target metal by ultra-violet radiation
- B. The bombardment of the target by protons
- C. The bombardment of target by electrons
- D. The absorption of radiation by the target metal
Explanation
Characteristic X-rays arise when incident electrons eject inner-shell electrons from target atoms and electrons from higher shells fall into the vacancies, emitting photons of definite energies. The likely mistake is choosing absorption of radiation, which does not explain the discrete characteristic emission lines.
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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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