f1 f0Ĭorrect V1=965m/s V0=343m/s Concept Question A sound wave having frequency f0, speed v0 and wavelength l0, is traveling through air when in encounters a large helium-filled balloon. Inside the balloon the frequency of the wave is f1, its speed is v1, and its wavelength is l1Compare the frequency of the sound wave inside and outside the balloon 1.
Speed of a sound wave depends on the medium: Ideal gas (adiabatic compression and expansion of gas): v = (g k T/m)1/2 g=cp/cv Liquid (Bad=Bulk modulus, volume change under adiabatic conditions): v = (Bad/r)1/2 Solid Bars (Y=Young’s modulus): v = (Y/r)1/2į0 f1 correct Concept Question A sound wave having frequency f0, speed v0 and wavelength l0, is traveling through air when in encounters a large helium-filled balloon. The larger the amplitude the larger the sound. Loudness: amplitude of the pressure wave (air pressure over distance). The frequency is the number of cycles per second that passes by a given location. Each cycle of a sound wave consists of one rarefication and condensation. Sound waves in air are traveling disturbances of varying air pressure: slightly less (rarefication) and higher than normal (condensation). 
Sound needs a medium, it does not exist in vacuum.Sound is a longitudinal wave, created by a vibrating object (e.g.it only depends on the medium through which it travels : v = / T = f Speed of a transverse wave traveling along a string: Today’s lecture will cover Textbook Sections16.5 - 16.10įrom Last Time: Speed of a wave is a constant, i.e.
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