Advertisements
Advertisements
प्रश्न
What is the condition necessary for an echo to be heard distinctly?
Advertisements
उत्तर
Echo is a reflected sound heard after the original sound strikes a rigid obstacle...
The conditions are-
1- The reflecting surface should have a larger reflecting surface than the wavelength of the sound
2- The minimum distance to hear the echo should be 17m in the air or as described by the formula `(Vt)/2`...
APPEARS IN
संबंधित प्रश्न
Define amplitude term in relation to a wave.
Define wavelength term in relation to a wave.
Define the term Frequency (as applied to sound waves)
Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves, and thermal radiation, the energy is propagated by mechanical waves.
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
What are fishing boats?
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
Write short notes on reflection of sound waves from plane and curved surfaces.
The direction of the incident sound, the direction of reflected sound, and the normal are in different Planes.
