2 a A girl stands 160 m away from a high wall and claps her hands at a steady rate so that each clap coincides with the echo of the one before. If she makes 60 claps in 1 minute, what value does this give for the speed of sound? b If she moves 40 m closer to the wall she finds the clapping rate has to be 80 per minute. What value do these measurements give for the speed of sound? c If she moves again and finds the clapping rate becomes 30 per minute, how far is she from the wall if the speed of sound is the value you found in a?

Question
2 a A girl stands 160 m away from a high wall and claps
her hands at a steady rate so that each clap coincides
with the echo of the one before. If she makes 60
claps in 1 minute, what value does this give for the
speed of sound?
b If she moves 40 m closer to the wall she finds the
clapping rate has to be 80 per minute. What value
do these measurements give for the speed of sound?
c If she moves again and finds the clapping rate
becomes 30 per minute, how far is she from the wall
if the speed of sound is the value you found in a?

Image Transcription

2 a A girl stands 160 m away from a high wall and claps her hands at a steady rate so that each clap coincides with the echo of the one before. If she makes 60 claps in 1 minute, what value does this give for the speed of sound? b If she moves 40 m closer to the wall she finds the clapping rate has to be 80 per minute. What value do these measurements give for the speed of sound? c If she moves again and finds the clapping rate becomes 30 per minute, how far is she from the wall if the speed of sound is the value you found in a?

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