Question

Tasks:
Part 1:
A fisherman sees his float bouncing up and down in the waves, 8 times a minute. He estimates that the distance between two wave crests is 12 meters. At what speed do the waves propagate?

Part 2:
The picture shows the standing wave pattern in a tube that is open at both ends.
L = 41 cm.


a) Determine the frequency of the tone described by the wave pattern.
b) What is the frequency of the fundamental tone of the tube?

Answer 1

The frequency of float bouncing

$$f=\frac{N}{t}=\frac{8}{60\:\rm s}=0.13 \:\rm Hz$$

The speed of the wave

$$v=\lambda f=12\:\rm m\times 0.13\:\rm Hz=1.6\:\rm m/s$$