How is Sound Measured?

 

How is Sound Measured?

How is Sound Measured?

Amplitude measures how forceful the wave is. It's measured on a scale and reported in decibels or dBA of instantaneous sound pressure. 0 dBA is that the softest level that an individual can hear. Normal speaking voices are around 65 dBA. A concert can reach about 120 dBA but is usually at 100 dB.

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Sounds that are 82 dBA or above can permanently damage your ears when exposed for an extended period of your time. The more instantaneous sound pressures a sound has, the less time it takes to cause damage. For instance, a sound at 85 dBA may take as long as 8 hours to cause permanent damage, while a sound at 97 dBA can start damaging hair cells after only half-hour of listening.

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Frequency is measured within the number of sound vibrations in one second. A healthy ear can hear sounds of very low frequency, 20 Hertz (or 20 cycles per second), to a really high frequency of 20,000 Hertz. Rock bottom A key on the piano is 27 Hertz. The center C key on a piano creates a 262 Hertz tone. The very best key on the piano is 4186 Hertz.