Energy difference in the Balmer series for the longest wavelength is:
Correct answer: A. 1.89 eV
- A. 1.89 eV
- B. 2.9 eV
- C. 5.6 eV
- D. 7.8 eV
Explanation
Students should learn that the longest wavelength in the Balmer series is 656 nm. We use the formula Energy = hc / wavelength, so energy = 6.63 x 10-34 x (3x108) / 656 x 10-9 which gives us 3.03 x 10-19 Joules. We divide this by the charge of the electron, i.e. 1.6 x 10-19 to get 1.89 eV.
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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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