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Sound and Hearing
Transcript of Sound and Hearing
We hear sounds between 0 dB and 120 dB.
The decibel scale is based on a power of 10, so a 20 dB
sound is 100 times greater than a 0 dB. Music is made when objects vibrate with standing waves.
Many instuments will use something that allows the sound to resonate off of. Resonance is the response of a standing wavee to another wave of the same frequency. Ultrasound is sound above
what we can normally hear (20Hz -
20,000 Hz. Ultrasound can be used
in the medical clinic as well as in the
ocean. Sonar is a type of ultrasound.
Sonar stands for sound navigation
and ranging. As a sound approaches a listener,
the sound waves are compressed
between the listener and the source
of the sound. This compression of
sound waves makes the pitch increase.
As the source moves away from the listener,
the waves spread out and the pitch decreases. The frequency of a sound wave depends on how fast
the source of the sound is vibrating. Pitch is the frequency
of the sound as the listener percieves it. As the frequency increases
the sound pitch goes up. As the frequency decreases, the pitch goes down.