1. a. Name a musical instrument that is used to produce high - pitched notes.

b. Explain why the musical instrument you have named in part a produce high-pitched note

c. Explain how you would produce loud sounds from this musical instrument

d. Draw the trace you might expect to see on an oscilloscope when this instrument is producing a loud, high-pitched note

2. a. What is an echo

b. Explain how echoes are used by ships to find the depth of the ocean beneath them

c. A ship hears the echo form a sound wave 4 s after it has been emitted. f the speed of sound in water is 1500 m/s, calculate the depth of the water beneath the ship.

3.a. What is meant by the phrase a person's audible range is 20 Hz to 20.000 Hz

b Explain why the vibrating strings of a violin produce sounds with a higher frequency than those produced by the strings of a cello

c. Calculate the wavelength of sound waves whose frequency is 68.000 Hz. Assume that the waves are travelling through air at a speed of 340m/s.