3. A child standing in front of a wall claps his hand and hears the echo after 0.5 s. find his distance from the wall.the velocity of sound is= 340 m/s
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Answer:
Time of echo= 0.5 sec velocity of sound = 340m/s
Distance = (340x 0.5)/2
Distance (speed-time)/2
Distance = 170/2
Distance = 85 m
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photosynthesis is the process by which plants get thier own food
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