Sound principle of rubber band piano

The tighter you pull it, the higher the tone.

The sound intensity perceived by human ears is called loudness, and loudness is also called volume. Loudness depends on the vibration amplitude of the sound source and refers to the distance from the center. All sounding objects are vibrating, and the greater the vibration amplitude, the greater the loudness. Knocking on a long pipe is less noisy than knocking on a short pipe. The vibration amplitude of the long tube must be small. Of course, the loudness of the sound is different when hitting the same object with different strength.

definition

Amplitude refers to the maximum value that the physical quantity of vibration can reach, which is usually represented by a, and it is a physical quantity representing the amplitude and intensity of vibration. In mechanical vibration, the amplitude is the absolute value of the maximum displacement from the equilibrium position when the object vibrates, and the amplitude is equal to the maximum displacement in numerical value. The amplitude is a scalar, expressed in meters or centimeters. Amplitude describes the amplitude and intensity of vibration of an object.

In AC circuit, current amplitude or voltage amplitude refers to the maximum change of current or voltage, also known as the peak value of voltage or current. In acoustic vibration, amplitude is the maximum difference between sound pressure and static pressure. The amplitude of sound waves is measured in decibels. The amplitude of sound waves can determine the intensity of sound.