What is the distance required to hear a echo?....explain briefly
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hope this helps....
pls mark it as the brainliest....
reason -
this because the sound persists in our ears for about 0.1 second after the exciting stimulus ceases to act .
now
distance = (speed x time)/2
for air-
velocity of sound = 340 m/s
time = 0.1s
distance = (340 x 0.1)/2 = 17 m