The Physics
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Opus in profectus

Periodic Waves

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Discussion

Definition

Characteristics

speed, amplitude, wavelength, period, phase, frequency

Selected wave speeds (slowest to fastest)
m/s km/h device, event, phenomena, process
1 3.6 nerve impulses, unmyelinated cells
12 43 stadium wave
100 360 nerve impulses, myelinated cells
180 660 tsunami
331 1,190 speed of sound, STP (0 °C)
340 1,225 speed of sound, sea level
343 1,235 speed of sound, room temperature (20 °C)
1,500 5,400 speed of sound in water
2,000 6,000 seismic waves
6,900 25,000 detonation velocity of TNT
124,000,000 446,000,000 speed of light in diamond
299,792,458 1,079,252,850 speed of light in a vacuum

Wave functions

speed, amplitude, wavelength, period, phase, frequency

f(xt) = A sin(2π(ft − x/λ) + φ)

seismic energy propagates through the Earth within the 50 Hz to 0.001 Hz range! The expression "long period" (greater than 10 seconds) and "short period" (less than 1 second or greater than 1 Hz)