Advertisements
Advertisements
Question
Define the term wave velocity. Write its S.I. unit.
Advertisements
Solution
The distance travelled by a wave in one second is called its wave velocity.
Its SI unit is metre per second (ms-1).
APPEARS IN
RELATED QUESTIONS
Distinguish between loudness and intensity of sound.
Write true or false for a given statement.
A ticking clock sound is heard late when heard through a metal.
What is the vacuum? Explain why, sound cannot travel through vacuum?
The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).
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)?
In which medium the speed of sound is more: humid air or dry air? Give a reason to your answer.
Describe a simple experiment to determine the speed of sound in air. What approximation is made in the method described by you?
An observer X is on an island 5500 m from a vertical cliff on the shore. A ship Y is anchored between the island and the Cliff. A blast on the ship’s siren is heard twice by X, the interval being 5s. [Velocity of sound = 330 ms−1]
(i) Find the distance of the ship from the island.
(i) Find the distance of the cliff from the ship.
Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound. Mark the position of compression and rarefaction on this curve. Also, define wavelengths and time periods using this curve.
