ECHO
SOUND BOUNCES BACK
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Bouncing Back from a Cliff
HELLO!
…hello!
d = ?
t =
time to go and come back
340 m/s
speed of sound
distance to the cliff
1. Formula
d = v × t ÷ 2
÷2 because the sound goes and comes back
2. Shart
For an echo the cliff must be at least 17 m away
(the brain separates sounds 0.1 s apart)
3. Uses
SONAR: depth of the sea
Bats: finding the way in the dark
MATRIC PHYSICS · SOUND · PUNJAB BOARDS
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