Question

2a. A row of seats is parallel to a stage at a distance of 8.0 m from it. At the center and front of the stage is a diffraction horn loudspeaker. This speaker sends out its sound through an opening that is like a small doorway with a width D of 0.073 m. The speaker is playing a tone that has a frequency of 2.00×1042.00×104 Hz. The speed of sound is 343 m/s. What is the separation between two seats, located near the center of the row, at which the tone cannot be heard?
m

2b. . A guitar string is 90 cm long and has a mass of 3.00 g. From the bridge to the support post (L) is 55 cm, and the string is under a tension of 570 N. What is the frequency of the first overtone?

Answer 1