![]() Where: delta I is the change in sound intensity incident on the transducer and V 1 and V 2 are two different transducer output voltages. ![]() Î I ( d b ) = 10 l o g I 2 I 1 \Delta I(db)=10log\frac For sound intensity, the dB equation becomes: Units are typically in watts/m 2 or watts/cm 2. Sound intensity is defined as the sound power per unit area perpendicular to the wave. Sounds and their Decibels Source of Sound One hundred and twenty decibels is the threshold of pain. If a noise is loud enough, over 120 decibels, it can be painful to listen to. Listening to loud sounds, sounds with intensities above 85 decibels, may damage your ears. A whisper is about 10 decibels while thunder is 100 decibels. Decibels and intensity, however, do not depend on the ear. The human ear is more sensitive to high sounds, so they may seem louder than a low noise of the same intensity. Loudness cannot be assigned a specific number, but intensity can. The sound of your friend yelling is loud, while the sound of your own breathing is very soft. We are used to measuring the sounds we hear in loudness. In general, we call sounds with a higher intensity louder. The same sound is more intense if you hear it in a smaller area. Intensity is the amount of energy a sound has over an area. As amplitude increases, intensity also increases. The more energy a wave has, the higher its amplitude. Sound is a wave and waves have amplitude, or height. The differences between sounds are caused by intensity, pitch, and tone. Fire alarms are loud, whispers are soft, sopranos sing high, tubas play low, every one of your friends has a different voice.
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