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Physics 1251 - Physics 1251 Unit#1 Fundamentals of Sound...

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Review Unit #1 1 Physics 1251 Unit #1 Fundamentals of Sound Review Sheet o Longitudinal waves move along the direction of propagation of the wave. o Transverse waves move perpendicular to the direction of propagation of the wave. o Sound is a longitudinal pressure/displacement wave with frequency from 20 Hz to 20 kHz . o Pressure is the force per unit area. o { p = F/a } unit: Pascal [Pa] =[N]/[m] o Sound requires a medium such as air, water or solid to propagate. o The velocity of sound is determined by the square root of the ratio of the “springiness” to the “inertia” of the medium. v = vB/? for example. o Light and radio waves are transverse oscillations in the electromagnetic force field and require no medium. o Sound travels faster in warm air than cold because the molecules are moving faster when hotter. o { v = 343 m/s + 0.6(T-20C) m/s } o The period P of a wave is the time it takes to make one oscillation. Unit: second [s]. o The frequency f is the rate of oscillation, number of oscillations per second. Hertz [Hz] = 1/[s].

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