Ch. 14 Review

1
Ch. 14 Review
2
Approved Equations

• See the cover page of the test.

3
Unapproved Equations

• Past experience shows that students sometimes use
  the following relationships as starting points.
  This isnt allowed and results in substantial
  point penalties.
• Frequency relationships for standing waves, such
  as fn nv/(2L)
• Harmonic relationships such as fn nf1
• Doppler shift equations such as f f/(1 u/v).

4
Skills/Knowledge for Ch. 14

• See Ch. Reviews in the main menu of the course
  home page. Click on Chapter Objectives.
• See individual assignments for applications.
  Examples follow.

5
Lessons of the various Ch. 14 assignments

• Dynamics of wave motion (wave speed as a function
  of tension and linear density)
• Dynamics v (FT/m)0.5
• Kinematics l v/f
• The latter equation is just v Dx/Dt applied to
  wave motion.

6
E.14.2 Traveling Waves

• Equation of a traveling wave
• Equation of a single point of the wave medium
• For a transverse wave, how do the above motions
  compare?
• For a longitudinal wave, how do the above motions
  compare?

7
L146 Doppler Effect

• This is about changes in wavelength and frequency
  in front of and behind moving sources of sound.
• Note that the frequency shift formulas are not AP
  approved equations.
• You have to be able to calculate wavelengths in
  front of and behind the source. This is simply
  kinematics and is presented in guide G14-1.

8
P147 Superposition and Interference

• What is the path difference? How is it
  determined?
• How is the path difference used to determine if
  interference is constructive or destructive?
• What does the angular separation of interference
  maxima depend on and how does it depend on those
  things?

9
L148 Standing Waves on a String

• What are the conditions necessary to produce a
  standing wave in a medium?
• Application of the dynamic and kinematic wave
  equations to waves on a string
• Relating the length of the string to the
  wavelength of the standing waves
• Drawing standing wave patterns for different
  harmonics (You must be able to draw and recognize
  these and indicate where nodes and antinodes are.)

10
V117 Speed of Sound in an Air Column

• What was the goal?
• How was the wavelength determined?

11
L149,151 Standing Waves in Pipes

• Knowing what is meant by an open and a closed
  pipes
• Drawing standing wave patterns for open and
  closed pipes and being able to identify locations
  of nodes and antinodes
• Relating the length of the pipe to the wavelength
  of the standing wave
• Frequency formulas such as fn nv/(2L) are not
  allowed starting points.

12
V118 Beats

• The beat frequency is the difference of the two
  component frequencies.