Question

The diagrams show the sound waves produced in one second from various tuning forks.

Which sound wave has the lowest pitch?

An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again.
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again. The line pattern then repeats.
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats.

Answer 1

The first diagram. It has the fewest complete wave cycles in one second (lowest frequency), so it produces the lowest pitch (longest wavelength).