Advertisements
Advertisements
Question
What is meant by an echo? Explain.
Advertisements
Solution
An echo is a repetition of sound produced by the reflection of sound waves from a wall, mountain or other obstructing surfaces. The minimum distance from a sound-reflecting wall to hear an echo at 20°C is 17.2 meter.
APPEARS IN
RELATED QUESTIONS
Displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
1) Amplitudes
2) Wavelengths
What is the condition necessary for an echo to be heard distinctly?
State the use of echo by a bat, dolphin and fisherman.
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
What is a stethoscope ? Name the principle on which a stethoscope works.
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
Define the term Frequency (as applied to sound waves)
State two factors on which the natural frequency of a body depends.
A radio signal, sent towards the surface of the moon, is received in 2.5 seconds. If the speed of the radio waves is 3 × 108 ms−1, find the distance of the moon from the earth.
