Atomic line spectra and energy levels Quiz
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5 questions, one answer each
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1. An electron moves from −1.51 eV to −3.40 eV. What happens?
- A. A photon of 1.89 eV is absorbed
- B. A photon of 1.89 eV is emitted
- C. A photon of 4.91 eV is emitted
- D. No photon is emitted
2. Why do atoms of different elements give different line spectra?
- A. They have different numbers of photons
- B. They contain different numbers of free electrons
- C. They are at different temperatures
- D. They have different sets of energy levels
3. A photon with energy not equal to any energy gap in an atom passes through. What happens?
- A. It is not absorbed
- B. It is absorbed and re-emitted
- C. It excites the electron to an intermediate level
- D. It is absorbed with the excess lost as heat
4. An atom emits a photon of energy 4.0 × 10⁻¹⁹ J. What is its frequency (h = 6.63 × 10⁻³⁴ J s)?
- A. 2.7 × 10⁻⁵² Hz
- B. 1.7 × 10¹⁵ Hz
- C. 6.0 × 10¹⁴ Hz
- D. 4.0 × 10¹⁹ Hz
5. An atom has three energy levels. How many different photon frequencies can it emit from the top level?
- A. 3
- B. 1
- C. 2
- D. 6