Physics Practice: Propagation of Sound Waves (Mock Test 4 - Expert Logic)
1. Expert Case: If the frequency of a source is $500\text{ Hz}$, how many times does the air at a particular point reach maximum density in one minute?
2. Two observers $A$ and $B$ are standing in a medium. Observer $A$ hears a sound of $100\text{ Hz}$ and $B$ hears $200\text{ Hz}$. The ratio of the speed of sound heard by $A$ to that heard by $B$ is:
3. A sound wave of wavelength $\lambda$ travels from air into a liquid. If the speed in liquid is three times the speed in air, the new wavelength is:
4. The pitch of a siren produced by a fast-moving ambulance appears to change. This phenomenon is known as ________.
5. Which of the following is used to measure the depth of an ocean?
6. If the ratio of the amplitudes of two waves is $3:4$, the ratio of their intensities is:
7. The phase difference between a compression and its nearest rarefaction is ________.
8. Supersonic speed means the speed of an object is ________.
9. The speed of sound in air is independent of ________ at constant temperature.
10. When we increase the loudness of a sound, we are actually increasing its ________.
11. A person hears his echo from a hill after $2\text{ seconds}$. If the speed of sound is $340\text{ m/s}$, the distance of the hill is:
12. Which of the following frequencies is infrasonic?
13. The persistence of sound in a closed hall due to multiple reflections is called ________.
14. To hear a distinct echo, the minimum distance of the obstacle from the source should be approx ________ in air.
15. The wavelength of a wave is doubled while keeping frequency constant. Its speed ________.
16. Sound waves of frequency $100\text{ Hz}$ have a time period of ________.
17. In which of the following media will sound travel the fastest?
18. The S.I. unit of wave velocity is ________.
19. A wave with amplitude $5\text{ cm}$ has a peak-to-peak displacement of ________.
20. The motion of sound waves in air is an example of ________ propagation.