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Physics Core/AP 1 and 2

Chapter 11: 7-16 Assignment

Course Materials are always under revision! Weblecture content may change anytime prior to two weeks before scheduled chat session for content.

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Physics 11: 7-16 Waves and interference


Reading Preparation

Text Reading: Giancoli, Physics - Principles with Applications, Chapter 11: 7-16

Study Points

Key Equations

  • Speed of transfers wave on a cord: v   =   F T μ ,   F T   =   tension ,   μ   =   mass / unit   length
  • Speed of longitudinal wave through a solid medium v   =    E ρ ,   E   =   elastic   modulus ,   ρ   =   density
  • Speed of longitudinal wave through a liquid medium v   =    E ρ ,   B   =   bulk   modulus ,   ρ   =   density
  • Intensity of a spherical wave (eminating from point source): Intensity   =   energy time area   =   power area   =   P 4 π   r 2
  • Energy carried by longitudinal wave:
    S = cross-section area
    A = amplitude E   =   ½ k A 2   =   ( 2 π 2 m f 2 ) A 2   = 2 π 2 ρ Svt f 2 A 2
  • Length of fixed-end string where harmonic n = 1,2,3.... l   =   n λ n 2
  • Fundamental frequency f 1   =   v λ 1
  • Frequency of harmonic n
  • f n   =   v λ n   =   n   f 1
  • Law of refraction sin   θ 2 sin   θ 1   =   v 2 v 1

Web Lecture

Read the following weblecture before chat: Analyzing Wave Motion

Study Activity

Use the simulation to explore wave motion on a string. Chose oscillate as the first option to explore.

  • Set damping to zero. Modify the amplitude of the motion. Can you create a standing wave?
  • Keep damping at zero. Modify the frequency of the motion. Can you create a standing wave?
  • What happens if you select loose end or no end?
  • What happens if you add damping?
  • What happens if you change tension?

Physics simulation Java Applets are the product of the PHET Interactive Simulations project at the University of Colorado, Boulder.

Chat Preparation Activities

Chapter Quiz

Lab Work

If you want lab credit for this course, you must complete at least 12 labs (honors course) or 18 labs (AP students). One or more lab exercises are posted for each chapter as part of the homework assignment. We will be reviewing lab work at regular intervals, so do not get behind!