# Lect33 - Physics 101 Lecture 33 Sound q Today's le...

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Physics 101: Lecture 33, Pg 1 Physics 101: Physics 101: Lecture 33 Lecture 33 Sound Sound Today’s lecturewill cover Textbook Sections 16.5 - 16.10

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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: amplitudeof the pressure wave(air pressure over distance). The larger the amplitude the larger the sound.

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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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