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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
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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
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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
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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
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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
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Law of relfection
Spherical Abberation
Equations of Mirrors
Critical points
- θi=θr 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
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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.
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CONCAVE at f
No image when object is at focal point
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CONCAVE INSIDE f
- Upright, Virtual Image
- When drawing ray diagrams, if object is inside f, carry invisible lines behind mirror
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CONVEX MIRRIORS
Upright and virtual
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