I need help solving these problems. Please show all of the steps to each solution! Thank you.
2. A closed tube has a length of 0.75m. What are two lowest frequencies of this tube at 25oC?
3. One jet engine produces a sound level of 120dB. What is the sound level of four identical jet engines?
4. An open tube has a length of 1.20m. What are the two lowest frequencies of this tube at 31oC?
5. A car moving at 18m/s is approached from behind by a police car moving at 26m/s. If the police siren emits a sound at 520Hz, what is the frequency heard by the driver of the car?
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