4. The diagram below shows three water wavefronts A, B and C moving from deep water to shallow water Wavefront A has just reached the boundary between the deep
water and the shallow water. Parts of wavefronts B and C have already crossed into
the shallow water. The direction of these incident wavefronts is marked and the
nomals to the boundary are marked N.
Deep water
Incident wave
direction
Shallow water
A
B
5.0 cm
(I) Use the words
Stays the same
increases
decreases
To describe what happens to the following properties of the waves as they travel
into the shallow water.
Speed
Wavelength
Frequency
[3]
Carefully complete the diagram above to show wavefronts B and C as they travel
through the shallow water
[2]
(1) The water waves are made by a long bar vibrating in the water
The long bar makes 24 vibrations in 6 seconds. Calculate the frequency of the water
waves produced. Include the unit
Frequency
(3)