15_Travelling_Waves_and_Sound

15_Travelling_Waves_and_Sound - Review question chapter 14...

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1 Review question chapter 14 Page 480. problem 33 The amplitude of an oscillator decreases to 36.8%. ..
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2 Traveling Waves and Sound Mechanical and Field waves Transverse and longitudinal waves Wave speed Sinusoidal waves Wave intensity Sound waves Doppler effect and shock waves
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3 Traveling Waves Sound waves Doppler effect Shock waves
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4 Mechanical and Field waves • Mechanical waves travel through a well defined medium, e.g. sound through air, ocean waves across water. • Field waves can travel through a vacuum – such as EM waves (radio, light, X-rays), and quantum waves, gravitational waves. • We are going to cover mechanical waves.
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5 Two types of waves Transverse waves – medium moves perpendicular to the direction of the wave. Longitudinal waves – medium moves parallel. Transverse – ropes, water, earthquakes (S), (light) Longitudinal – sound, compression springs, earthquakes (P)
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6 Traveling Waves • Traveling waves transfer energy from one point to another. • They travel through a medium which does not get transferred from the source to destination. Pulse Wave
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7 Wave speed • The speed of the wave is a property of the medium – tension of the rope or spring, pressure of the air. • For perfect systems, the speed does not depend on the frequency or amplitude of the wave.
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8 Wave speed in a string The speed of a wave increases with the tension on the string, T s , measured in Newtons. The speed decreases with the linear density of the string, μ. where Linear density, μ , has units kg/m, and is the mass per unit length. L m
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Wave speed in a string It can be shown that the speed of a wave along a string is Where T s is the tension (in N) on the string, and μ is the mass per unit length (m/L in kgm -1 ) of the string. String tension and linear density
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This note was uploaded on 12/28/2011 for the course PHYSICS 122 taught by Professor Bhagat during the Fall '11 term at Maryland.

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15_Travelling_Waves_and_Sound - Review question chapter 14...

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