Advertisements
Advertisements
Question
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey.
Solution
Dolphins sends the sound having frequencies between 120 kHz to 150KHz. The returning echoes used to help their prey.
APPEARS IN
RELATED QUESTIONS
Why is sound wave called a longitudinal wave?
The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
State the factors on which the pitch of a sound depends.
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.
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.
State the effect of pressure on the speed of sound in air.
Through which medium sound travels faster, iron or water? Give reason.
Give scientific reason.
In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.
