英語翻譯
1.a.A girl stands 160m 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 40m 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
2.a.The distance between two consecutive rarefactions in a sound wave is 2.5m.The speed of sound in air is 330m/s.Calculate the frequency of this sound wave.
b.A person makes a loud sound and hears the echo of this sound 1.2s later.Calculate how far the person is from the object causing the echo.Assume that the speed of sound is 330m/s.
看在我那么辛苦的把它打在這個上面，