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An open tube is resonating at two successive harmonics of frequencies 650 HzHz and 980 HzHz...

An open tube is resonating at two successive harmonics of frequencies 650 HzHz and 980 HzHz .  

A) What is the fundamental frequency of the tube?

B) What is the speed of sound if the length of the tube is 33cm

C) What is the frequency of the 4th harmonic?

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