General Physics 2Induction1 Q1 - Standing Waves Tension wave Wave on a string transverse Sound wave Longitudinal Air inside a tube Density of air above.

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Presentation transcript:

General Physics 2Induction1 Q1 - Standing Waves Tension wave Wave on a string transverse Sound wave Longitudinal Air inside a tube Density of air above or below equilibrium point

Waves on a Slinky Measure the wavelength and period for the first, second, and third harmonics using meter sticks and stop watches. To measure the frequency, wiggle the slinky ten times and measure the time. Ten divided by the time is the frequency. Create a formula for frequency of any of the harmonics on the slinky in terms of the first harmonic. General Physics 2Induction2

General Physics 2Waves & Sound3 Reflection & Transmission when end is fixed, reflected wave in inverted when end is free to move, reflected wave is not inverted

General Physics 2Waves & Sound4 Reflection & Transmission when a wave enters a heavier material, part of the wave is reflected and part is transmitted

General Physics 2Induction5 Standing Wave Wave travelling to the right Reflected wave travelling to the left The total wave function (superposition principle) Simplifies to the equation for a standing wave

String fixed at both ends Nodes occur when kx = 0 = kL General Physics 2Induction6 Fundamental frequency when n = 1

General Physics 2Waves & Sound7 Sources of sound String instruments Strings are fixed at both ends. sound is amplified by sounding box sounding board Figure out the equation for harmonic wavelengths in terms of L, where L is the length of the unstretched string.

General Physics 2Waves & Sound8 Pair Problem A highway overpass was observed to resonate as one full loop when a small earthquake shook the ground vertically at 4.0 Hz. The highway department put a support at the center of the overpass, anchoring it to the ground. What resonant frequency would you now expect for the overpass? Earthquakes rarely do significant shaking above 5 or 6 Hz. Did the modifications do any good?

General Physics 2Waves & Sound9 Sources of Sound: Wind Instruments

General Physics 2Waves & Sound10 Closed at one end

General Physics 2Waves & Sound11 Interactive Physics Exploration of Physics Waves on a Rope Adding Waves Standing Waves