9.Echo is a type of
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Answer:
reflection of sound.______________
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Explanation:
Echo is reflection of sound which requires a minimum distance of 17 meters for us to hear the echo, because sounds are heard as the same unless there is a gap of 0.1 seconds between the real sound and echo.
The formula to find Velocity of sound, Time and distance is
: 2d/t = v
2d = v*t
d = v*t / 2
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