South Africa Matric · Physical Sciences

Waves, light and matter

11 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 11 questions

  1. A source of sound moves towards a stationary observer. The observer detects a frequency that is
  2. In the photoelectric effect, increasing the intensity of light of a fixed frequency above the threshold frequency
  3. An atom emits a line spectrum when its electrons
  4. A wave source vibrates with a frequency of 10 Hz. What is the period of the vibration?
  5. A wave has a frequency of 500 Hz and a wavelength of 0.68 m. Calculate its speed.
  6. A wave has a frequency of 440 Hz and a wavelength of 0.75 m. Calculate its speed.
  7. A wave travels at m·s⁻¹ with a wavelength of m. Calculate its frequency.
  8. A wave travels at m·s⁻¹ with a wavelength of 1.7 m. Calculate its frequency.
  9. Calculate the energy of a photon of frequency 5 × 10¹⁴ Hz (h = 6,63 × 10⁻³⁴ J·s).
  10. Calculate the energy of a photon of frequency 7 × 10¹⁴ Hz (h = 6,63 × 10⁻³⁴ J·s).
  11. Calculate the energy of a photon of frequency 6 × 10¹⁴ Hz (h = 6,63 × 10⁻³⁴ J·s).

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