Also, this unit can be useful to express different reference pressures or intensity. This scale is termed as Decibel Scale or DB Scale. This unit is generally used to express the ratio of some value of the physical property to another. As this energy can be measured, then the most common SI unit of sound which is used is the Decibel and it is abbreviated as dB. Sound is another form of energy which travels in the form of waves through the medium like liquid, air, or even solid substances. One more difference is the fact that sound waves are generally the longitudinal type of waves whereas light waves are the transverse waves. This property is very much in the contrast with the property of light. A sound wave cannot travel through the vacuum. The frequency of the vibrating source of sound is computed in terms of cycles per second. In the sound, frequency is also termed as Pitch. This parameter then decides about the sound is perceived as high pitched or low pitched. These are amplitude, frequency, wavelength, and timbre.įrequency in the sound wave refers to the rate of the vibration of the sound travelling through the air as a medium. Many characteristics of the sound waves are important to understand. This compression and expansion further create a minute pressure difference which we are perceiving as the sound.

The sound is a wave, which moves through some medium by alternately contracting and expanding parts of the medium through which it is travelling. the to and fro motion of the body is known as Vibration. Due to this, we may feel the shaking effect.

Now instead of just listening to the bell, put the finger on the bell after hearing it. When some strike a bell, it makes a loud ringing noise. 2 FAQs about Decibel Introduction of Sound as a WaveĪ sound is the form of energy, similar to electricity, heat, or light.

Decibel unit