what are the 4 conditions to hear echo
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We can only hear echo of the original sound only in places where the reflecting objects or surfaces are more than 17m away from the direct sound source.We can also hear echo on the places where the materials or reflecting surfaces do not absorb the sound To hear a distinct echo, The interval b/w Original and reflected sound must be 0.1 sec.And the reflecting object must be bigger then the wavelength of the sound.
Bats cannot see so the produce a type of sound and listen to it's echo and hence locate and catch its prey
Bats cannot see so the produce a type of sound and listen to it's echo and hence locate and catch its prey
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the four conditions are
The distance between the sound source and the reflecting surface must not be less than 17 metres where the time period between hearing the original sound and its echo should not be less than 0.1 of a second .
The human ear can not distinguish between two successive sounds if the period between them is less than 0.1 second , Wide and bigreflecting surface must be presented to hear the echo such as the walls , the mountains or the water bodies .
The velocity of sound through the air is 340 m / sec , so the distance travelled by the sound and its echo in 0.1 sec = 34 metres , The distance travelled by the sound is 17 metres from the sound source to the reflecting surface and 17 metres from the reflecting surface to the ear ( echo ) .
The echo can not be heared if the distance between the sound source and the reflecting surface is less than 17 metres because the time between hearing the main sound and its echo will be less than 0.1 of a second , and the human ear can not distinguish between the two successive sounds .
When the distance between hearing the main sound and the reflecting surface is multiplies of 17 metres ( twice or three times ) , the echois heard in the form of the last two or three phrases of the whole produced sound .
The distance between the sound source and the reflecting surface must not be less than 17 metres where the time period between hearing the original sound and its echo should not be less than 0.1 of a second .
The human ear can not distinguish between two successive sounds if the period between them is less than 0.1 second , Wide and bigreflecting surface must be presented to hear the echo such as the walls , the mountains or the water bodies .
The velocity of sound through the air is 340 m / sec , so the distance travelled by the sound and its echo in 0.1 sec = 34 metres , The distance travelled by the sound is 17 metres from the sound source to the reflecting surface and 17 metres from the reflecting surface to the ear ( echo ) .
The echo can not be heared if the distance between the sound source and the reflecting surface is less than 17 metres because the time between hearing the main sound and its echo will be less than 0.1 of a second , and the human ear can not distinguish between the two successive sounds .
When the distance between hearing the main sound and the reflecting surface is multiplies of 17 metres ( twice or three times ) , the echois heard in the form of the last two or three phrases of the whole produced sound .
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