Advertisements
Advertisements
Question
Define the term intensity of a sound wave. State the unit in which it is measured.
Advertisements
Solution
The intensity at any point of the medium is the amount of sound energy passing per second normally through unit area at that point. Its unit is microwatt per metre2.
RELATED QUESTIONS
Why are sound waves called mechanical waves?
Fig. shows three ways in which a string of length l in an instrument can vibrate.
 |
 |
 |
| (i) | (ii) | (iii) |
- Which of the diagram shows the principle note?
- Which vibration has the frequency four times that of the first?
- Which vibration is of the longest wavelength?
- What is the ratio of the frequency of the vibration in (i) and (ii)?
The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.
(i) Who would hear the sound first: boatman or diver?
(ii) Give a reason for your answer in part (i).
(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?
How is sound perceived by us?
The speed of sound is more in hydrogen than in nitrogen. Is this statement true? Give a reason for your answer.
What is musical sound? Give an example.
200 waves pass through a point in one second. Calculate the time period of wave.
The wavelength of the vibrations produced on the surface of water is 2 cm. If the wave velocity is 16 ms-1, calculate:
- no. of waves produced in one second
- time required to produce one wave.
Can you hear the sound produced due to the vibrations of second's pendulum?
Distinguish between light and sound waves. What are the consequences of the large difference in the speed of sound and that of light? Briefly explain them.
