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Lecture24 - PHYSICS 149: Lecture 24 Chapter 11: Waves 11.8...

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PHYSICS 149: Lecture 24 • Chapter 11: Waves – 11.8 Reflection and Refraction – 11.10 Standing Waves • Chapter 12: Sound – 12.1 Sound Waves – 12.4 Standing Sound Waves Lecture 24 Purdue University, Physics 149 1
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Final Exam • Thursday, May 5, 3:20 – 5:20 PM • Place: PHYS 333 • Chapters 1 – 15 (only the sections we covered) • The exam is closed book. • The exam is a multiple-choice test. • There will be 30 multiple-choice problems. – Each problem is worth 10 points. • You may make a single crib sheet. – you may write on both sides of an 8.5” × 11.0” sheet. • Conflicts: I need to know by Monday Apr 25. • Adaptive learners should contact Prof. Neumeister ASAP Lecture 10 2 Purdue University, Physics 149
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ILQ 1 A thick string and a thin string made of the same material have equal tensions. Which has the larger speed of waves on these strings? A) thin string B) thick string C) waves have the same speed Lecture 24 Purdue University, Physics 149 3
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ILQ 2 Of these properties of a wave, the one that is independent of the others is its A) frequency B) wavelength C) amplitude D) speed Lecture 24 Purdue University, Physics 149 4
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Lecture 24 Purdue University, Physics 149 5 Harmonic Waves y(x,t) = A sin( ω t – kx) A = Amplitude= Maximum displacement of a point on the wave λ = Wavelength: Distance between identical points on the wave T = Period: Time for a point on the wave to undergo one complete oscillation. f = frequency=1/T ω = angular frequency= 2 π /T k = wave number = 2 π / λ
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Lecture 24 Purdue University, Physics 149 6 Wave Speed A wave y = A cos( ω t - kx) travels in +x direction A wave y = A cos( ω t + kx) travels in -x direction
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Lecture 24 Purdue University, Physics 149 7 Superposition Principle • When two or more waves pass through the same region the actual displacement is the sum of the separate displacements. • If two waves pass through the same region they continue to move independently.
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Lecture 24 Purdue University, Physics 149 8 Interference • Interference describes what happens when two waves are travelling in the same direction through the same region of space. • Superposition principle: the resulting displacement is the algebraic sum of their separate displacement y (x,t) = y 1 (x,t) + y 2 (x,t) – It the two waves arrive with the same amplitude (both waves have a crest): constructive interference and the resultant pulse is larger then either pulses. – It the two waves arrive with opposite amplitude (one has a crest, the other a valley): destructive interference the resulting pulse could be zero.
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Lecture 24 Purdue University, Physics 149 9 Interference and Superposition
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Purdue University, Physics 149 10 Reflection • When a wave travels from one boundary to another, reflection occurs. Some of the wave travels backwards
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Lecture24 - PHYSICS 149: Lecture 24 Chapter 11: Waves 11.8...

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