2. (3 pt} Consider a pipe of length 93 cm, closed at one end and open at the other. (3) Draw the seventh harmonic (fourth overtone) soundwave in the pipe, and find its wavelength. 3. (4 pt) You and a friend are riding bicycles (fast!) in the same direction. Your speed is 10.00 mils and theirs is 9.00 ms. They are behind you and ring a bell, which sounds to you as if it's got a frequency of 1001 Hz. If the speed of sound is taken to be 343 ms, (a) What is the bell's frequency? (b) What is the frequency a stationary observer would hear as the two of you bike towards them? 4. (4 pt} A sound monitor measures a sound pressure level of 7'20 dB, 6.20 m away from a sound source. If the sound is coming from a small speaker that can be approximated as a point source, (a) what is the power of the sound at the source? (b) If three such speakers (with the power found in a} are placed next to one another, how far away from them would the sound monitor measure a value of 7'21) dB?|