Chapter 20

Chapter 20: The Energy of Waves

Animation courtesy of Dr. Dan Russell, Kettering University

What is a wave? (Besides at a ballgame…lol) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What do waves carry? ,[object Object],[object Object]

Some waves need help to travel… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How waves travel: ,[object Object],[object Object],[object Object]

B. Transverse Waves ,[object Object],corresponds to the amount of energy carried by the wave crests troughs wavelength wavelength amplitude amplitude nodes

C. Longitudinal Waves ,[object Object],Amount of compression corresponds to amount of energy  AMPLITUDE. rarefaction compression wavelength wavelength

Longitudinal Wave ,[object Object],[object Object]

Properties of Waves ,[object Object],[object Object]

Waves ,[object Object],[object Object],[object Object],[object Object],[object Object]

Waves ,[object Object],[object Object],[object Object]

Properties of Waves… ,[object Object],[object Object]

D. Measuring Waves ,[object Object],[object Object],[object Object],v =  × f v : velocity (m/s)  : wavelength (m) f : frequency (Hz)

D. Measuring Waves ,[object Object],WORK: v =  × f v = (3.2 m)(0.60 Hz) v = 1.92 m/s GIVEN: v = ?  = 3.2 m f = 0.60 Hz  v f

D. Measuring Waves ,[object Object],WORK: f = v ÷  f = (5000 m/s) ÷ (417 m) f = 12 Hz GIVEN:  = 417 m v = 5000 m/s f = ?  v f

Waves ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

Wave Interactions… Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object]

More wave interactions… ,[object Object]

Wave interactions… ,[object Object]

Last wave interaction… ,[object Object],[object Object],[object Object],[object Object],[object Object]

More on interference waves ,[object Object],[object Object],[object Object]

Interference Waves can be deadly! July 1, 1940- Tacoma Bridge Accident

Chapter 20

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Chapter 20