1. Properties of waves

2. Wave speed = frequency x wavelength A tape measure - distance
Properties of waves
compressions 
rarefactions 
Wave speed = frequency x wavelength
Wave speed = 1000 Hz x 1.5 m
Wave speed = 1500 m/s
Period =
frequency =
1000
= s
A tape measure - distance
A stop watch time F D
6.2 Start timer when you see the
sound being made A C
Stop timer when you hear
the echo.
speed = distance
time
speed = 200
0.65 =
= m/s
Take several time measurements,
& calculate a mean value.
Increase the distance.
In the same direction
perpendicular to

4. refraction
Wavefronts change direction and travel slower on entering the shallow water.
They refract away from the normal as they speed up again in the deeper water 4.
sec Hz
660
0.5
330
660
0.0015