They protested by marching in the streets.
This is false. Your hypothesis, or prediction, is just that: a prediction. Saying its a failure will result in bias.
Pressure is the force per unit area. This means that the pressure a solid object exerts on another solid surface is its weight in newton’s divided by its area in square metres
Convert 10mm to metres = 0.01m
Wave speed = frequency *wavelength
= 4Hz*0.01m
= 0.04 m/s
Hope this helps
