What Determines the Speed of Waves?

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SUMMARY

Wave speed is fundamentally determined by the properties of the medium, specifically its elasticity and mass density, as expressed in the equation v = √(τ/μ). While the relationship between wave speed, wavelength, and frequency is given by v = λƒ, it is important to note that this relationship holds true independently of the medium's properties. Dispersion occurs in certain contexts, such as in two-dimensional waves like surface waves on water, where wave speed can vary with wavelength.

PREREQUISITES
  • Understanding of wave mechanics and basic physics principles
  • Familiarity with the equations v = λƒ and v = √(τ/μ)
  • Knowledge of elasticity and mass density in materials
  • Concept of dispersion in wave phenomena
NEXT STEPS
  • Study the effects of elasticity and mass density on wave propagation in different media
  • Explore the concept of dispersion in two-dimensional waves, particularly in water
  • Investigate the relationship between frequency, wavelength, and wave speed in various contexts
  • Examine real-world applications of wave speed in engineering and physics
USEFUL FOR

Students studying physics, educators teaching wave mechanics, and professionals in fields related to acoustics and fluid dynamics.

duran9987
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Homework Statement


A bit confused here as to what wave speed is dependent on. At first I learned that v = λƒ, and a couple of pages later in my textbook I find that v = √(τ/μ). Also, I found that speed is only dependent on the properties of the medium, specifically its elasticity and mass. Where does wavelength and frequency come into play if the medium is the only dependent?

Homework Equations


none

The Attempt at a Solution

 
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In many contexts, the properties of the medium determine the speed of waves in it independently of their wavelengths. This is (mostly) true of waves in a stretched string and waves in a 3 dimensional compressible medium. Any deviation from this is known as dispersion. In particular, it does not apply to 2 dimensional waves, such as surface waves on water. See http://en.wikipedia.org/wiki/Dispersion_(water_waves).

Regardless of what determines the speed of a wave, its frequency and wavelength are always related by v = λƒ.
 

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