Lecture20

# Lecture20 - Lecture 20 Purdue University Physics 220 1...

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Unformatted text preview: Lecture 20 Purdue University, Physics 220 1 Lecture 20 Waves Textbook Sections: 12.5-12.8 PHYSICS 220 Midterm Exam 2 • Scaled to 150 pts: this is what it matters. – Mean: 102.4 – Standard Deviation: 28.6 • Your exams and keys are accessible through CHIP. • Exam papers will be discarded on April 14. Lecture 13 Purdue University, Physics 220 2 Lecture 20 Purdue University, Physics 220 3 • The net disturbance is the sum of the individual disturbances. • When waves cross in a point and have the same sign amplitude, they add constructively. • Since intensity is proportional to amplitude squared, the resulted intensity is more than the sum of the intensities of individual waves. Constructive Interference Lecture 20 Purdue University, Physics 220 4 • The net disturbance is the sum of the individual disturbances. • When waves cross in a point and have the opposite sign amplitude, they add destructively. • Since intensity is proportional to amplitude squared, the resulted intensity is less than the sum of the intensities of individual waves. Destructive Interference Lecture 20 Purdue University, Physics 220 5 In phase =0 Out of phase by = Out of phase by =(2/3) Fully Destructive Destructive Constructive Destructive Interference Lecture 20...
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## This note was uploaded on 04/23/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue.

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Lecture20 - Lecture 20 Purdue University Physics 220 1...

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