How to amplify sound wave

1. Can sound waves be amplified?
2. What increases a sound wave?
3. What is used to amplify the intensity of sound waves?

Can sound waves be amplified?

An electric current through a semiconductor nanostructure amplifies sound waves at extremely high frequencies. This method enables novel, very compact sources of ultrasound, which can serve as a diagnostic tool for imaging materials and biological structures with very high spatial resolution.

What increases a sound wave?

As the frequency increases, the number of sound waves passing through in a given second will increase. This will result in the passing of an increased amount of energy per second which is associated with the wave. Also with the increasing frequency, the shrillness or pitch of the sound increases.

What is used to amplify the intensity of sound waves?

In a SASER device, a source (e.g., an electric field as a pump) produces sound waves (lattice vibrations, phonons) that travel through an active medium. In this active medium, a stimulated emission of phonons leads to amplification of the sound waves, resulting in a sound beam coming out of the device.