A tunnel under a river is 1.80 km long. (a) At what frequencies can the air in the tunnel resonate? (Use n to represent the harmonics where  n = 1, 2, 3,   . Frequencies are in Hz. Do not include units in your answer. Take the speed of sound in air to be 343 m/s.)

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Chapter1: Units, Trigonometry. And Vectors
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A tunnel under a river is 1.80 km long.

(a) At what frequencies can the air in the tunnel resonate? (Use n to represent the harmonics where 
n = 1, 2, 3,   . Frequencies are in Hz. Do not include units in your answer. Take the speed of sound in air to be 343 m/s.)

fn =
 
 

(b) Explain whether it would be good to make a rule against blowing your car horn when you are in the tunnel.
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