Spectrums by David Blatner

Author:David Blatner [Blatner, David]
Language: eng
Format: epub
ISBN: 9781408832455
Publisher: Bloomsbury Publishing

Echo, Echo When we explored light and its wavelengths, we were dealing with extremely small fluctuations in electromagnetic radiation—sizes on the order of millionths and billionths of a meter. Sound waves are far longer. Even the highest pitch we can hear—the one with the most vibrations per second and therefore the smallest waves—represents a wave about 1.7 cm long, from crest to crest. That’s about 20,000 times longer than the longest visible electromagnetic wave we can see, red light!

You can easily calculate a wavelength by dividing the speed of sound by the frequency of the sound. So the musical note middle C, with a vibrational frequency of about 262 Hz, corresponds to a wave about 4.3 feet (1.3 m) long. The lowest pitch humans can hear is an astounding 75 feet (22 m) long.

Of course, traveling at 343 m/sec, these long waves, with their alternating increase and decrease of air pressure, still roll over us in a matter of milliseconds.

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