Lect33 - Physics 101 Lecture 33 Pg 1 Physics 101 Physics...

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Unformatted text preview: Physics 101: Lecture 33, Pg 1 Physics 101: Physics 101: Lecture 33 Lecture 33 Sound Sound ● Today’s lecture will cover Textbook Sections 16.5 - 16.10 Physics 101: Lecture 33, Pg 2 From Last Time: From Last Time: v = λ / T = λ f μ T m/L T v = = Speed of a wave is a constant, i.e. it only depends on the medium through which it travels : Speed of a transverse wave traveling along a string: Physics 101: Lecture 33, Pg 3 Sound Sound ● Sound is a longitudinal wave, created by a vibrating object (e.g. , vocal cords, guitar string). ● Sound needs a medium, it does not exist in vacuum. ● Sound waves in air are traveling disturbances of varying air pressure: slightly less (rarefication) and higher than normal (condensation). ● Each cycle of a sound wave consists of one rarefication and condensation. The frequency is the number of cycles per second that passes by a given location. ● Human ear: frequency = 20 – 20,000 Hz ● Loudness: amplitude of the pressure wave (air pressure over distance). The larger the amplitude the larger the sound. Physics 101: Lecture 33, Pg 4 Speed of Sound Speed of Sound ● Speed of a sound wave depends on the medium:...
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This note was uploaded on 02/12/2012 for the course PHYSICS 104 taught by Professor Staff during the Fall '10 term at Rutgers.

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Lect33 - Physics 101 Lecture 33 Pg 1 Physics 101 Physics...

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