EJU Japan · EJU Physics

Waves and Sound

16 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 16 questions

  1. A siren emitting 600 Hz moves at 68 m/s directly towards a stationary listener. Taking the speed of sound as 340 m/s, what frequency does the listener hear?
  2. A siren emitting 1000 Hz moves at 68 m/s directly towards a stationary listener. Taking the speed of sound as 340 m/s, what frequency does the listener hear?
  3. A siren emitting 1000 Hz moves at 170 m/s directly towards a stationary listener. Taking the speed of sound as 340 m/s, what frequency does the listener hear?
  4. A siren emitting 500 Hz moves at 68 m/s directly towards a stationary listener. Taking the speed of sound as 340 m/s, what frequency does the listener hear?
  5. A open-ended (both ends open) tube of length 0.85 m has air at which the speed of sound is 340 m/s. What is the fundamental frequency?
  6. A closed-end (one end closed) tube of length 0.17 m has air at which the speed of sound is 340 m/s. What is the fundamental frequency?
  7. A closed-end (one end closed) tube of length 0.34 m has air at which the speed of sound is 340 m/s. What is the fundamental frequency?
  8. A open-ended (both ends open) tube of length 0.17 m has air at which the speed of sound is 340 m/s. What is the fundamental frequency?
  9. In a double-slit experiment, light of wavelength 600 nm passes through slits 0.2 mm apart. The screen is 2 m away. What is the spacing between adjacent bright fringes?
  10. In a double-slit experiment, light of wavelength 400 nm passes through slits 0.5 mm apart. The screen is 2 m away. What is the spacing between adjacent bright fringes?
  11. In a double-slit experiment, light of wavelength 500 nm passes through slits 1 mm apart. The screen is 1 m away. What is the spacing between adjacent bright fringes?
  12. In a double-slit experiment, light of wavelength 600 nm passes through slits 0.2 mm apart. The screen is 1.5 m away. What is the spacing between adjacent bright fringes?
  13. Light travels from air into a medium of refractive index 4 at an angle of incidence of 30. What is , where is the angle of refraction?
  14. When a sound wave passes from air into water, which quantity stays the same?
  15. Two waves of equal frequency and amplitude meet at a point with a phase difference of . What is the resulting amplitude?
  16. In a transverse wave, the particles of the medium vibrate

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