It is used for the acoustic measurements. Also, the voice of a woman has a high pitch than that of a man. For example, a bird produces high-pitched sound, but the roaring of a lion is a low-pitched sound. Whereas, if the sound is having a lower pitch then it will have a lower frequency of vibration. Thus, with the higher frequency of vibration, the sound is shrill and has a high pitch. Pitch of Sound is the property, depending on the frequency of the vibration of waves. Each type of wave has a certain amplitude. The loudness of the sound wave is also determined by its association with the amplitude. The following table describes the data for various sources of sound. Sounds having values above 80 dB become the noise to human ears. The loudness of sound is directly related to the square value of the amplitude of the vibration. So, if the amplitude of the sound wave is large, then the sound will be loud. Various phenomena of the sound depending on the amplitude of the sound wave. Besides the decibel, some of the other sound units are sone, phon, Hertz (Hz), watt per square meter. But, remember that the sound intensity given in dB in the air will be different from dB in water. 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. Let’s study the decibel unit in a simple manner.Ī sound is the form of energy, similar to electricity, heat, or light. This logarithmic quantity is the power level or field level. It is to express the ratio of one value of a power or field quantity to another on a certain logarithmic scale. Thus, a suitable unit for the measurement of sound is used. If we consider the power, the sound of the thunderclap is approximately 1,000,000,000,000 times more powerful than the power of sound which is in the smallest audible range. As our ear is incredibly sensitive, and we can hear everything from our fingertip brushing lightly over the skin to a loud thunderclap. Therefore, the intensity of sound is needed to be measured using some standard units. Its measurement is also important for our safety, as the loud noise can actually damage our hearing capacity. The sound is all around us and we can measure it too.
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