Which of the following X-rays have highest energy?
Correct answer: B. Kβ
- A. Kα
- B. Kβ
- C. Both A and B
- D. None of the above
Explanation
The energy of Kα is given by:E(Kα) = EL - EKThe energy of Kβ is given by:E(Kβ) = EM - EKThus it is clear that:E(Kα) < E(Kβ)To give a quick reminder, when an electron vacancy in the K shell is filled by an electron from the L shell, the characteristic energy/wavelength of the emitted photon is called the K-alpha (Kα) spectral line, and when the K shell vacancy is filled by an electron from the M shell, the characteristic energy/wavelength of the emitted photon is K-beta (Kβ).
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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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