Speed of a Travelling Wave
المؤلف:
Professor John W. Norbury
المصدر:
ELEMENTARY MECHANICS & THERMODYNAMICS
الجزء والصفحة:
p 194
1-1-2017
2770
Speed of a Travelling Wave
A handy formula for wave speed is easy to get! In one complete cycle the wave travels a distance x = λ and takes a time t = T to do it. Thus the wave speed must be
Simple algebra also gives
Example What is the amplitude, wavelength, frequency and speed of the wave described by
with all quantities in SI units (i.e. 5 m, 3 m-1 and 2 sec-1).
Solution The general wave is
Thus the amplitude is
the wave number is
and angular frequency is
Now 
giving
and 
giving
and the speed is
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