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Physics Light and Sound
Transcript of Physics Light and Sound
we interpret as volume, both loud and soft The increase in amplitude of oscillation Sound concepts Resonance Sound Concepts Node Point along a standing wave where
the amplitude is the lowest (0). Sound Concepts Anti Node Point along a standing wave where
amplitude is the maximum distance from
the central line Sound Concepts Diffraction Change in the directions and intensities of a group of waves after passing through a medium Sound Concepts Interference (constructive) When a standing wave interferes with another wave creating larger amplitude when they intersect. The waves actually pass through each other instead of bouncing off of each other as it looks like. Sound Concepts Interference (destructive) When a standing wave interferes with another creating a smaller amplitude when they intersect. At the node the wave appears to be non-existent anymore. Instruments! Harp Connor's Guitar-ish thing The guitar was made out of a plank of wood,
an altoids box as the body, and a metal wire for the string. The pitch was changed by either increasing or decreasing tension making the pitch higher or lower respectively. Auxilary Andy's Pan Flute Belonged to the auxiliary family because it is a secondary instrument. It was made out of pvc
piping. The pitches were changed by increasing the length of the pipes creating a longer wavelength making the frequency (or pitch) go down. Horn Bens horn thing It was in the horn family because he made waves by vibrating his lips. He changed the pitch by vibrating his lips faster or slower. LIGHT CONCEPTS Color Color is the wavelength (or wavelengths)
That the object reflects. The other colors are absorbed by the object. Reflection Occurs when an object has the same frequency, Bounces light back to the sender and/or in other directions Refraction The process by which a beam of light or other system of waves is spread out as a result of passing through a medium http://buphy.bu.edu/~duffy/PY105/35b.GIF Bibliography Convex Mirror A mirror that bends outwards and reflects light outward,
Concave Mirror A mirror that bends inward and reflects light inward. Concave Lense Convex Lense A light that bends outward and refracts light inward. Constructive
Interference Destructive Interference http://dr282zn36sxxg.cloudfront.net/datastreams/f-d%3Aab24e3fffa746167fb8c766efbb21c9ba9ce8e6102d5e580f81e0afa%2BIMAGE%2BIMAGE.1 After waves intersect, they continue unchanged After waves intersect, they continue unchanged http://www.mat.ucsb.edu/~g.legrady/academic/courses/10f200a/md/image/negative_refraction.jpg In this case: Light reflect from the straw has to go from water, through the glass, and into the air http://4.bp.blogspot.com/-oIDjRrDpcLs/TskGkhcYCrI/AAAAAAAAA6A/OP2xtZg1Mtg/s1600/Convex-Mirror.jpg A lense that bends light inward and refracts light outward. Equation: F = v / 4L v = velocity
l = length
F = frequency Notice, the greater the length, the lower the frequency/pitch http://van.physics.illinois.edu/qa/pictures/1946/889377729__lens.GIF