1) A sound wave travelling at 340 m/s produces waves of wavelength 2.0 m.

What is the frequency of the sound wave?

2) A student stands between two parallel walls at X and fires a pistol. She hears the first two echoes 1.0 s and 1.5 s after firing the pistol.

What is the distance between the two walls?
(Assume the speed of sound in air is 340 m s^-1.)

3) Which of the following correctly compares the speed of sound in air V₁, to that in water V₂, to that in the ground V₃?

4) A pure note is displayed on the screen of a C.R.O. as shown in the diagram below.

If the time base setting of the C.R.O. is set to 2.0 ms cm^-1, what is the frequency of the note?

5) The pitch of a sound is determined by its