The total energy of an electron in the 4th orbit in a H-atom is:
Correct answer: B. -0.8eV
- A. -13.60eV
- B. -0.8eV
- C. -3.40eV
- D. -1.51 eV
Explanation
The total energy of an electron in the fourth orbit of a hydrogen atom is negative because it is bound to the nucleus. Its value is 0.85 electron volts below the energy of a free electron.
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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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