# AP PHYSICS_WAVES

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1. Name important parts of a long. and transverse wave
• Crests-High Part
• Trough-Valley
• Amplitude-from middle to top
• Period-1/f (time to complete one cycle)
• Cycle-complete to and fromortion, from top to top
• Frequency-number of complete cycles in a second
• V=λf
2. What is intensity?
What is loudness?
What is the intensity threshold?
• I=P/A (W/m2)
• β=10 log I/Io
• I=1x10-12

Each 10 dB corresponds to a 10-fold change in intensity
3. Standing Waves and Harmonics
Equation of Wave lengths
• λ=2L (length of string)
• Open on both or none
• fn=n v/2L
• Open on one end
• fn= n v/4L
4. Doppler Affect
Source Moving
Observer Moving
Speed of Sound
• f ' = f/(1+vsource/vsound) SOURCE MOVING -- if its going away + if its coming towards -
• f '= f ( + vsource/vsound) OBSERVER MOVING--if going towards + if going away -
• Speed of Sound==343 m/s
5. Order of Light Waves
Speed of Light
• Radio Waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-rays, Gamma Rays
• Large Wave Length---------------------------------------------------Smaller Wave Lenghts
• Low Frequency--------------------------------------------------------High Frequency
• c= 3x 108
6. Law of relfection
Spherical Abberation
Equations of Mirrors
Critical points
• θir on a flat mirror
• Spherical Abberation-not a true focused image
• 1/f=1/q+1/p
• M=-q/p
• M= h'/h
• p=object to mirror
• q=image to mirror
• f=focal point
• c=2f
7. CONCAVE MIRRORS (outside f)
• have a negative magnification
• are inverted, real images
• When drawing images, draw parrallel and then through focal point, and then through focal poing and parrallel.
8. CONCAVE at f
No image when object is at focal point
9. CONCAVE INSIDE f
• Upright, Virtual Image
• When drawing ray diagrams, if object is inside f, carry invisible lines behind mirror
10. CONVEX MIRRIORS
Upright and virtual
 Author: Anonymous ID: 4298 Card Set: AP PHYSICS_WAVES Updated: 2010-01-16T16:14:06Z Folders: Description: AP PHYSICS TEST ON SOUND Show Answers: