Beats and basic wave phenomena - Question Bank
1. Which of the following is a characteristic of diffraction?
2. The phenomenon of beats is a direct consequence of which principle?
3. A source of sound emitting a frequency of 500 Hz is moving towards a stationary observer with a velocity of 30 m/s. The speed of sound is 330 m/s. The apparent frequency heard by the observer is:
4. The time period of beats is the reciprocal of:
5. If two waves of amplitude A1 and A2 interfere destructively, the resultant amplitude is:
6. If two waves of amplitude A1 and A2 interfere constructively, the resultant amplitude is:
7. Which phenomenon explains why we can hear a person talking around a corner?
8. In the phenomenon of beats, the frequency of maximum loudness is equal to:
9. When tuning fork A (frequency 256 Hz) and tuning fork B are sounded together, 5 beats are heard in 10 seconds. If the frequency of B is slightly increased, the number of beats per second increases. What is the frequency of B?
10. The phenomenon where waves spread out from a point source is called:
11. Which of the following is a consequence of the superposition principle?
12. Two tuning forks A and B vibrate with frequencies 400 Hz and 405 Hz respectively. The number of beats heard per second is:
13. If two tuning forks of frequencies f1 and f2 are sounded together, the number of beats heard per second is given by:
14. The condition for observing significant diffraction of light through a single slit is that the width of the slit should be:
15. The phenomenon of diffraction is observed for:
16. A tuning fork A produces 4 beats per second with tuning fork B. When a little wax is attached to A, it produces 6 beats per second with B. If the frequency of B is 500 Hz, what is the frequency of A?
17. When a tuning fork of frequency 'f' is sounded with a tuning fork of frequency 250 Hz, 5 beats are heard per second. If the frequency of the first tuning fork is increased, the number of beats per second increases. What is the original frequency 'f'?
18. A tuning fork of frequency 256 Hz is sounded with another tuning fork. 4 beats are heard in 2 seconds. The frequency of the second tuning fork can be:
19. The phenomenon of beats is specifically related to the superposition of waves with:
20. Which of the following is NOT a basic wave phenomenon?
21. If the wavelength of a wave is 500 nm and the size of the aperture is 1000 nm, diffraction will be:
22. The bending of waves around the corners of an obstacle is a characteristic of:
23. When light passes through a narrow slit and spreads out, this phenomenon is known as:
24. Sound waves can be diffracted more easily than light waves because:
25. A single slit of width 'd' is illuminated by monochromatic light of wavelength 'λ'. For diffraction to occur, the condition is:
26. Which of the following phenomena demonstrates that light is a wave?
27. Which type of wave exhibits diffraction most prominently?
28. Diffraction is most significant when the size of the obstacle or aperture is:
29. The phenomenon of waves bending around obstacles or spreading out after passing through a narrow slit is called:
30. Which of the following statements about beats is INCORRECT?
31. When two waves of amplitudes A and 2A and frequencies f and 2f interfere, beats are observed. This statement is:
32. The phenomenon of 'beats' is an example of:
33. A siren produces 4 beats per second with a tuning fork of frequency 400 Hz. When the siren is moved away from a stationary observer at a speed of 17 m/s, the apparent frequency decreases by 10 Hz. The speed of sound is 340 m/s. What is the original frequency of the siren?
34. Two identical tuning forks produce 6 beats in 3 seconds. If the frequency of one tuning fork is 300 Hz, what is the frequency of the other tuning fork?
35. What is the time interval between two consecutive maxima of loudness in the phenomenon of beats?
36. The frequency of amplitude variation (beats) is f_beat. The frequencies of the two sources are f1 and f2. Then:
37. If two sound waves with amplitudes A1 and A2 and frequencies f1 and f2 superpose, the minimum amplitude of the resultant wave is:
38. If two sound waves with amplitudes A1 and A2 and frequencies f1 and f2 superpose, the maximum amplitude of the resultant wave is:
39. The minimum amplitude (near zero) in beats occurs when the phase difference between the two waves is:
40. The maximum amplitude in beats occurs when the phase difference between the two waves is:
41. The loudness of the sound in the phenomenon of beats varies periodically. This periodic variation in loudness is due to:
42. What is the condition for observing beats from two sound sources?
43. Two tuning forks A and B produce 8 beats in 4 seconds. When fork A is filed, 4 beats are produced in 2 seconds. If the frequency of fork B is 384 Hz, find the original frequency of fork A.
44. Two tuning forks A and B produce 5 beats per second. When the prong of fork A is slightly loaded with wax, 3 beats per second are produced. If the frequency of fork B is 500 Hz, what is the original frequency of fork A?
45. When a tuning fork is loaded with a small piece of wax, its frequency:
46. A tuning fork of frequency 440 Hz produces beats with a standard tuning fork. If 4 beats are heard in 2 seconds, what is the frequency of the other tuning fork?
47. The number of beats heard per second is equal to the:
48. If two tuning forks have frequencies f1 and f2, and f1 is slightly greater than f2, how many beats are heard per second?
49. The phenomenon of beats is a result of:
50. What phenomenon occurs when two sound waves of slightly different frequencies superpose?