The photoelectric effect Quiz
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5 questions, one answer each
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1. A metal has a work function of 4.0 × 10⁻¹⁹ J. What is its threshold frequency?
- A. 6.0 × 10¹⁴ Hz
- B. 1.7 × 10⁻¹⁵ Hz
- C. 2.7 × 10⁻⁵² Hz
- D. 6.0 × 10⁻¹⁴ Hz
2. The intensity of light above the threshold frequency is doubled. What happens?
- A. The maximum kinetic energy doubles
- B. The number of photoelectrons per second doubles
- C. The work function doubles
- D. The threshold frequency halves
3. Photoelectrons have a maximum kinetic energy of 3.2 × 10⁻¹⁹ J. What is the stopping potential?
- A. 0.50 V
- B. 1.6 V
- C. 3.2 V
- D. 2.0 V
4. Which observation does the wave model fail to explain?
- A. Emission of electrons from a metal surface
- B. A larger current with more intense light
- C. No emission below a threshold frequency, however intense the light
- D. Electrons leaving a metal surface
5. Light of photon energy 5.0 × 10⁻¹⁹ J is shone on a metal of work function 3.0 × 10⁻¹⁹ J. What is the maximum kinetic energy of the photoelectrons?
- A. 8.0 × 10⁻¹⁹ J
- B. 3.0 × 10⁻¹⁹ J
- C. 5.0 × 10⁻¹⁹ J
- D. 2.0 × 10⁻¹⁹ J