HKDSE (Hong Kong) · Physics

Wave Motion

19 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 19 questions

  1. A wave has frequency 200 Hz and wavelength 2 m. What is its speed?
  2. A wave has frequency 2 Hz and wavelength 0.2 m. What is its speed?
  3. A wave has frequency 200 Hz and wavelength 0.2 m. What is its speed?
  4. A wave has frequency 100 Hz and wavelength 3 m. What is its speed?
  5. A wave has frequency 50 Hz and wavelength 0.2 m. What is its speed?
  6. A source vibrates with a period of 0.5 s. What is its frequency?
  7. A source vibrates with a period of 4 s. What is its frequency?
  8. A source vibrates with a period of 0.02 s. What is its frequency?
  9. A source vibrates with a period of 0.2 s. What is its frequency?
  10. An object is placed 24 cm from a convex lens of focal length 15 cm. How far from the lens is the real image formed?
  11. An object is placed 24 cm from a convex lens of focal length 20 cm. How far from the lens is the real image formed?
  12. An object is placed 12 cm from a convex lens of focal length 10 cm. How far from the lens is the real image formed?
  13. An object is placed 10 cm from a convex lens of focal length 5 cm. How far from the lens is the real image formed?
  14. An object is placed 60 cm from a convex lens of focal length 10 cm. How far from the lens is the real image formed?
  15. Which type of wave is sound in air?
  16. Which of the following can travel through a vacuum?
  17. Which electromagnetic radiation has the shortest wavelength?
  18. What happens to a light ray when it passes from air into glass at an angle?
  19. Total internal reflection can occur only when light travels

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