Lecture_18

# Lecture_18 - Waves Waves A wave is a moving disturbance...

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Waves

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Waves A wave is a moving disturbance that transports energy without transporting matter Parts of the string move – kinetic energy String stretches – potential energy Some waves (mechanical) require a medium , others don't. The wave propagates along the direction of wave motion Waves can be transverse or longitudinal depending on the direction of disturbance relative to the direction of propagation
Quantification Some waves a periodic (in time and space). Use SHM: λ is the wavelength, the distance between adjacent troughs or crests. y end = A sin ( 2 π f t ) y = A sin ( 2 π f t 2 π x λ )

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Speed of a Wave v depends on the medium (or lack of) and type of wave. Not on f or λ! Example: Wave on a string. Wave will be faster in lighter, tauter (depends on Tension) string. where, μ is the mass/length and F T is the tension force. v = Δ x Δ t = λ T v = λ 1 / f = f λ v string wave = F T μ
Sound is a type of longitudinal mechanical wave (it requires a medium). Speed of sound in air 343 m/s.

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Lecture_18 - Waves Waves A wave is a moving disturbance...

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