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
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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
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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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