E.1 Structure of the atom Quiz
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5 questions, one answer each
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1. In the Geiger–Marsden experiment, a very few alpha particles rebounded. This showed that:
- A. Atoms are mostly empty space
- B. The atom has a small, dense, positive nucleus
- C. Electrons are negatively charged
- D. Gold is a dense metal
2. How many neutrons are in ?
- A. 11
- B. 12
- C. 23
- D. 34
3. An electron falls from −3.4 eV to −13.6 eV. The emitted photon's energy is:
- A. 3.4 eV
- B. 10.2 eV
- C. 13.6 eV
- D. 17.0 eV
4. A photon of wavelength 500 nm has energy of about:
- A. 2.5 eV
- B. 4.0 eV
- C. 0.25 eV
- D. 25 eV
5. Dark lines in a star's spectrum are caused by:
- A. Emission by the star's hot core
- B. Absorption of specific wavelengths by cooler gas in the outer layers
- C. Dust between the star and Earth
- D. The spectroscope