You visit a national park with your friend one weekend. Youencounter an old railroad tunnel which is very dark and you are notsure if the tunnel is blocked on the other end. You happen to havea frequency generator app on your cell phone frequency. You decidethat to generate resonances in the tunnel with your app. You hearsuccessive resonances at 55Hz, 57.5 Hz, 60Hz, 62.5 Hz …etc. (I) Canyou use this information alone to determine if the tunnel opened orclosed at the other end? (II) What is the length of the tunnel?(III) What is the maximum number of resonances you can produce inthis tunnel between 50 Hz and 100 Hz?  Use 343.0 m/s forthe speed of sound in air. (
