E.2 Quantum physics Quiz
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5 questions, one answer each
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1. Light of frequency below the threshold frequency falls on a metal. Increasing its intensity will:
- A. Release photoelectrons after a delay
- B. Release more photoelectrons
- C. Still release no photoelectrons
- D. Increase the work function
2. The work function of a metal is 2.0 eV and a photon of 3.5 eV strikes it. The maximum kinetic energy of the photoelectron is:
- A. 1.5 eV
- B. 2.0 eV
- C. 3.5 eV
- D. 5.5 eV
3. If the momentum of an electron doubles, its de Broglie wavelength:
- A. Doubles
- B. Halves
- C. Quarters
- D. Is unchanged
4. Which observation is evidence for the wave nature of matter?
- A. Compton scattering
- B. The photoelectric effect
- C. Electron diffraction by a crystal
- D. The existence of a work function
5. In Compton scattering, the scattered photon has:
- A. A shorter wavelength
- B. The same wavelength
- C. A longer wavelength
- D. A higher frequency