What frequencies (in Hz) will a 1.70 m long tube produce in the audible range (20 Hz−20, 000 Hz) at 24.0∘C for the following cases? (a) the tube is closed at one end lowest frequency Hz second lowest frequency Hz highest frequency (rounded to the nearest Hz) Hz (b) the tube is open at both ends lowest frequency Hz second lowest frequency Hz highest frequency (rounded to the nearest Hz) Hz