Wave and photon models of light Quiz
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5 questions, one answer each
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1. Which is the photon energy equation?
- A. E = h / f
- B. E = hf
- C. E = hλ
- D. E = f / h
2. What does the double-slit experiment show?
- A. Light is a stream of particles
- B. Photons have no energy
- C. Light shows interference, supporting the wave model
- D. Light travels faster in a vacuum
3. The frequency of a photon is tripled. What happens to its energy?
- A. It is multiplied by 3
- B. It is divided by 3
- C. It is multiplied by 9
- D. It is unchanged
4. A 5.0 W source emits photons of energy 2.5 × 10⁻¹⁹ J. How many photons per second?
- A. 1.3 × 10⁻¹⁹
- B. 5.0 × 10¹⁹
- C. 12.5 × 10⁻¹⁹
- D. 2.0 × 10¹⁹
5. Why does a brighter beam of the same colour not have more energy per photon?
- A. Brightness changes only the number of photons per second
- B. Brightness lowers the frequency
- C. Brightness changes the wavelength
- D. Photons do not carry energy