Energy levels and line spectra Quiz
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5 questions, one answer each
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1. A line spectrum is evidence that:
- A. electrons can have any energy
- B. electrons have discrete energy levels
- C. the nucleus emits photons
- D. light is a wave
2. An electron falls from a level at −1.5 eV to a level at −3.4 eV. What is the energy of the photon emitted?
- A. 1.9 eV
- B. 4.9 eV
- C. −1.9 eV
- D. 3.4 eV
3. Photon A is from a transition of 2.0 eV and photon B from a transition of 3.0 eV. Which statement is correct?
- A. A has a higher frequency than B
- B. A and B have the same wavelength
- C. B has a shorter wavelength than A
- D. B has a longer wavelength than A
4. A transition emits a photon of energy 3.0 × 10⁻¹⁹ J. What is its frequency?
- A. 4.5 × 10¹⁴ Hz
- B. 2.2 × 10⁻¹⁵ Hz
- C. 2.0 × 10⁻⁵² Hz
- D. 1.1 × 10⁷ Hz
5. Why do gas discharge lamps show a line spectrum?
- A. The gas is cold
- B. Atoms emit photons only for transitions between discrete levels
- C. Electrons orbit at all radii
- D. The glass absorbs most wavelengths