F11Physics1CLec13B

# F11Physics1CLec13B - Physics 1C Lecture 13B "I did never...

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Physics 1C Lecture 13B "I did never know so full a voice issue from so empty a heart: but the saying is true 'The empty vessel makes the greatest sound'." --William Shakespeare

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Announcements Problem 11 on facebook Today – sounds waves. Doppler Effect Seismic Waves Wave Interference
Quiz 1 Info It will be a Scantron test that covers Chapter 12 A list of equations, constants, and conversion factors will be provided on the quiz You are to write the version of your test on the Scantron form You will be given a Quiz Code Number that will be your Quiz ID for the rest of the quarter You are expected to abide by UC Policy on Integrity of Scholarship Please bring your IDs

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Quiz #1 Use ParSCORE test form, Scantron 48/TSM The Version Letter that is on the top center of your exam goes in the Test Form Area. The Quiz Code Number located on the front page goes under Exam Number. You should also put your name and the subject (although ID number you don’t really have to fill out). There will be no cheat sheets or discussion of the quiz with another student until you leave the lecture hall.
Description of a Sound Wave A sound wave may be considered either a displacement wave or a pressure wave The displacement of a small element is: s ( x,t ) = s max sin ( kx w t ) . Here k is the wavenumber, is the angular frequency of the piston. The variation D P in the pressure of the gas about its equilibrium value is also sinusoidal: D P = D P max cos ( kx – t ) The pressure wave is 90 o out of phase with the displacement wave.

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Doppler Effect Why does an ambulance siren moving towards you sound different than when it is moving away from you? It is wave property of sound.
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## This note was uploaded on 12/11/2011 for the course PHYS 1C taught by Professor Smith during the Fall '07 term at UCSD.

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F11Physics1CLec13B - Physics 1C Lecture 13B "I did never...

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