1.2Waves_001

1.2Waves_001 - 1.2 Waves Wave Waves A disturbance that...

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1 1.2 Waves Wave properties – speed – wavelength –Superposition of waves – Reflection of waves at an interface • Wave on a string –Speed of wave on a string • Sound waves – Sound Frequencies –Speed of Sound –Intensity of Sound Waves Waves • A disturbance that carries energy • Mechanical Waves- water wave, sound – must propagate through matter. • Electromagnetic Waves – radio, x-ray, light – can propagate through a vacuum. Wave on a string increasing time Transverse Wave - The displacement is perpendicular to the direction of propagation Longitudinal Wave- The displacement is parallel to the direction of propagation Transverse and Longitudinal Waves Examples • Transverse waves – Transverse wave on a string – Electromagnetic waves (speed = 3.00x10 8 m/s) • Longitudinal waves – Sound waves in air (speed = 340 m/s) Seismic waves are transverse and longitudinal P waves- longitudinal faster v~ 5000 m/s (granite) S waves – transverse slower v~ 3000 m/s (granite)
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2 Seismograph record after an earthquake. Time P S Simple Harmonic Waves Periodic displacement vs distance Harmonic oscillations Wavelength - Spatial Period Wave travels distance λ during one period T Wave velocity vf T λ = The wave travel at a velocity of one wavelength in one period. Units λ (meters) v T(seconds) = 1 v(meters/second) f T λ (meters) == meters/second 1/seconds v (meters)f(1/seconds) λ = meters/second Example A radio station transmits at a frequency of 100 MHz. Find the wavelength of the
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1.2Waves_001 - 1.2 Waves Wave Waves A disturbance that...

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