When a hydrogen atom is in its first excited level, what is the relation of radius and Bohr radius?
Correct answer: B. Four times
- A. Twice
- B. Four times
- C. Same
- D. Half
Explanation
For the first excited level (n=2), radius r₂ = n²r₀ = 2²r₀ = 4r₀, where r₀ is the Bohr radius.
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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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