AP PHYSICS_WAVES

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Author:
Anonymous
ID:
4298
Filename:
AP PHYSICS_WAVES
Updated:
2010-01-16 11:14:06
Tags:
waves
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Description:
AP PHYSICS TEST ON SOUND
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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

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