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PhysicsQ&A Library2 a A girl stands 160 m away from a high wall and clapsher hands at a steady rate so that each clap coincideswith the echo of the one before. If she makes 60claps in 1 minute, what value does this give for thespeed of sound?b If she moves 40 m closer to the wall she finds theclapping rate has to be 80 per minute. What valuedo these measurements give for the speed of sound?c If she moves again and finds the clapping ratebecomes 30 per minute, how far is she from the wallif the speed of sound is the value you found in a?Question

Asked Jan 18, 2020

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Step 1

Part (a): Distance between the girl and the wall = 160 m

Frequency of the clap = 60/60 = 1HZ

Step 2

Wavelength of the clap = (distance covered by sound to going to wall + distance covered by sound to coming back from the wall)

λ = 2 X 160 = 320 m

Speed of sound can be calculated as:

Step 3

Part (b): Distance between the girl and the wall = 160 – 40 =120 m

Wavelength = ...

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