lecture24-shock and standing waves-

lecture24-shock and standing waves- - What you will be able...

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Unformatted text preview: What you will be able to do a/er today how the Doppler efect can lead to a shock wave how two iden:cal waves moving in opposite direc:ons can Form a standing wave (superposi:on) the diference between a node and an:-node Explain the posi:on oF nodes and an:-nodes Calculate graph a standing wave based on two waves (one moving to the right and one moving to the le/) Apply 2 Shock Waves are a consequence of the Doppler effect (moving source) Animation At the speed of sound, wave fronts pile up in front of the object ( b shock front ` ). If an object moves faster than the speed of sound, it outruns the wave front emitted in the forward direction. At higher speeds, the pile-up occurs in a cone extending back from the object. The cone angle of the shock wave is given by In the shock front, a large amount of energy is concentrated: sonic boom from fast air planes, bow waves produced by a boat ( video ). sin ! = v sound v source v = ! f CONSTANT if the wave is hitting you more frequently will change inversely proportional to f Doppler effect question: does the MEDIUM change through which the sound wave travels? (depending on where the observer is) ONE variable is ALWAYS constant, but WHICH ONE? depends on the question !!! 4 A standing wave on a string vibrates as shown at the top. Suppose the tension is quadrupled while the frequency and the length of the string are held constant. Which standing wave pattern is produced? (1) (2) (3) (4) (5) Question 5 A standing wave on a string vibrates as shown at the top....
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This note was uploaded on 01/15/2012 for the course PHYS 101 taught by Professor Bates during the Winter '08 term at The University of British Columbia.

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lecture24-shock and standing waves- - What you will be able...

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