Yes, sound waves/pressure from a speaker can be used to push on water and cause it to move. Sound waves are mechanical waves that propagate through a medium, such as air or water, by causing particles in the medium to vibrate. When sound waves encounter a medium like water, they can transfer energy and create pressure variations in the water.
When a speaker produces sound waves, it creates compressions and rarefactions in the air. If the speaker is directed towards a body of water, such as a pool or a container, the sound waves can transmit through the air and interact with the water surface.
The pressure variations caused by the sound waves can generate vibrations in the water, resulting in ripples or waves. The water molecules are pushed and pulled by the alternating pressure zones of the sound waves, causing the water to move in a manner that corresponds to the sound wave's frequency and intensity.
It's important to note that the movement of water caused by sound waves is generally small-scale and may be more evident in confined spaces or when the sound waves are of sufficient amplitude. In larger bodies of water, the effects of sound waves on water movement may be less noticeable due to the dispersal and dissipation of the energy over a larger volume.
In summary, sound waves from a speaker can create pressure variations in water, leading to the movement of water particles and the generation of ripples or waves.