What is the nature of sound and what is it made of

The essence of sound is the transmission of energy.

The object vibrates + the medium propagates this vibration.

The vibration of the sound source generates sound waves, which propagate through the medium to the receiving end (such as the human ear), causing corresponding vibrations, which are finally sensed. At this point, we say: the sound source made the sound.

In fact, whether they are sensed or not, sound waves exist objectively. So we can be sure that sound is a wave.

Like electromagnetic waves, such as light waves, sound waves are refracted and reflected as they travel from one medium to another.

Unlike electromagnetic waves, the transmission of sound waves must be dependent on a medium. In a vacuum, sound waves cannot travel. The propagation of sound waves in a medium reduces the energy intensity of the wave, which is called attenuation.

Sound waves of different frequencies attenuate differently in the same medium, and sound waves of the same frequency attenuate differently in different media.

For example, the sound waves that can be heard by the human ear decay very quickly in the water and cannot travel far at all, so people under the water cannot hear the sound of speech on the shore. However, sonar (a device that emits ultrasound waves (Note 1) and receives ultrasound waves that are returned when encountering obstacles, can "hear" ultrasound waves underwater.

Note 1: The frequency range of sound waves is divided into three frequency bands:

One: Infrasonic (inaudible to the human ear) Hertz.

Second, sound waves: (audible to the human ear, varies from person to person) generally: 20-16000 Hz, three: ultrasound: (inaudible range of the human ear) 16000-10 12 Hz.

Sound is produced by the vibration of an object.

Sound is a wave generated by the vibration of an object, which is a wave phenomenon that propagates through a medium and can be perceived by the auditory organs of humans or animals. The object that initially vibrates is called the sound source.

Sound is produced by the vibration of an object, and the object that is emitting sound is called the sound source. Sound travels in the form of sound waves. Sound is simply the motion formed by the propagation of sound waves through solids or liquids, gases.

Introduction to sound

Sound is a sound wave produced by the vibration of an object. It is a wave phenomenon that propagates through a medium (air or solid, liquid) and can be perceived by the auditory organs of humans or animals. An object that initially emits vibrations (vibrations) is called a sound source.

Sound spreads vibrations (vibrations) in the form of waves. Sound is the motion formed by the propagation of sound waves through any medium.

Sound is a wave. Sounds that can be recognized by the human ear (frequencies between 20Hz and 20000Hz) are called sounds. The speed at which sound propagates in different media is generally solid, liquid, and gaseous (with the exception of:

Cork 500m s, less than kerosene (25), distilled water (25), etc.), the speed of sound propagation is related to the type of medium and the temperature of the medium.