Waves – Beats, Doppler Effect

Grade 11 Physics — Waves – Beats, Doppler Effect: 25 practice questions with instant scoring and explanations.

1. Beats are produced by superposition of two waves of:
2. The beat frequency equals:
3. If two tuning forks of 256 Hz and 260 Hz sound together, beats heard = :
4. Beats are audible when beat frequency is:
5. Beats are used to:
6. When beat frequency becomes zero, the two sources are:
7. Doppler effect is the change in:
8. Doppler effect occurs with:
9. When source moves towards stationary observer, observed frequency:
10. When source moves away from stationary observer, observed frequency:
11. The Doppler formula for source moving towards stationary observer is:
12. The Doppler formula for observer moving towards stationary source is:
13. If observer and source both move towards each other:
14. The Doppler effect is not observed when:
15. Red-shift in astronomy indicates:
16. Blue-shift indicates:
17. SONAR uses Doppler to:
18. RADAR detecting vehicle speed uses:
19. A source of 500 Hz moves at 34 m/s towards observer (v_sound = 340 m/s). Observed f ≈ :
20. If both source and observer move in same direction with same speed, observed f:
21. Doppler shift is more noticeable when:
22. A police siren appears higher pitched when the car:
23. The observed change in frequency in Doppler effect depends on:
24. The expansion of universe is evidenced by Hubble's observation of:
25. For Doppler effect in light, the classical formula is modified due to: