The energy of the 4th orbit in a hydrogen atom is:
Correct answer: D. -0.85 eV
- A. -2.51 eV
- B. -3.50 eV
- C. -13.6 eV
- D. -0.85 eV
Explanation
The energy of the nth energy level in hydrogenE = -R(1/n²) and R = 2.18x10-18 J Rydberg constant in JoulesE = -2.18x10-18 J (1 / 4²)E = -1.36x10-19 JE = 0.85 electron voltsThe negative sign is present because the 0-level is considered the highest energy, and so all of the other energy levels are in an "energy well."
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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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