# AP PHYSICS_WAVES

 Name important parts of a long. and transverse wave Crests-High PartTrough-ValleyAmplitude-from middle to topPeriod-1/f (time to complete one cycle)Cycle-complete to and fromortion, from top to topFrequency-number of complete cycles in a secondV=λf What is intensity? What is loudness? What is the intensity threshold? I=P/A (W/m2) β=10 log I/IoI=1x10-12 Each 10 dB corresponds to a 10-fold change in intensity Standing Waves and Harmonics Equation of Wave lengths λ=2L (length of string)Open on both or nonefn=n v/2LOpen on one endfn= n v/4L 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 Order of Light Waves Speed of Light Radio Waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-rays, Gamma RaysLarge Wave Length---------------------------------------------------Smaller Wave LenghtsLow Frequency--------------------------------------------------------High Frequencyc= 3x 108 Law of relfection Spherical Abberation Equations of Mirrors Critical points θi=θr on a flat mirrorSpherical Abberation-not a true focused image 1/f=1/q+1/pM=-q/pM= h'/h p=object to mirrorq=image to mirrorf=focal pointc=2f CONCAVE MIRRORS (outside f) have a negative magnificationare inverted, real imagesWhen drawing images, draw parrallel and then through focal point, and then through focal poing and parrallel. CONCAVE at f No image when object is at focal point CONCAVE INSIDE f Upright, Virtual ImageWhen drawing ray diagrams, if object is inside f, carry invisible lines behind mirror CONVEX MIRRIORS Upright and virtual AuthorAnonymous ID4298 Card SetAP PHYSICS_WAVES DescriptionAP PHYSICS TEST ON SOUND Updated2010-01-16T16:14:06Z Show Answers