What determines the intensity of sound?
Intensity results from two factors: the amplitude of the sound waves and how far they have traveled from the source of the sound. It depends on the amount of energy that started the waves. Greater amplitude waves have more energy and greater intensity, so they sound louder.
What is sound intensity and decibels?
Sound intensity is defined as the sound power per unit area. The usual context is the measurement of sound intensity in the air at a listener’s location. Decibels measure the ratio of a given intensity I to the threshold of hearing intensity, so that this threshold takes the value 0 decibels (0 dB). …
What is the difference between sound intensity and sound intensity level?
The unit called decibel (dB) is used to indicate that this ratio is multiplied by 10. The sound intensity level is not the same as sound intensity—it tells you the level of the sound relative to a reference intensity rather than the actual intensity.
What is the sound intensity level?
: the relative sound intensity at any point in a sound field as compared with a specified standard intensity that is usually expressed in decibels above or below the standard.
What is intensity of sound called?
Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m2).
How does intensity affect the sound?
The average amount of energy passing through a unit area per unit of time in a specified direction is called the intensityof the wave. As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder.
Which unit is used to measure the intensity of sound?
We measure sound intensity (also referred to as sound power or sound pressure) in units called decibels. Decibels (dB) are named in honor of Alexander Graham Bell, the inventor of both the telephone and the audiometer.
What does the intensity of sound depend upon?
The Intensity of Sound The intensity of sound, at a given distance, depends upon the amplitude of the waves. Thus, a tuning fork gives out more energy in the form of sound when struck hard than when struck gently.
What scale is used to define sound intensities?
Because of the enormous nonlinearity of the ear in sensing pressure waves, a nonlinear scale is convenient in describing the intensity of sound waves. Such a scale is provided by the sound intensity level, or decibel level, of a sound wave, which is defined by the equation