Stan W Zochowski Condensed Matter and Materials Physics
- Slides: 30
Stan W. Zochowski Condensed Matter and Materials Physics Department of Physics and Astronomy University College London http: //www. cmmp. ucl. ac. uk/~swz/#IUL
Wave pulse Animation courtesy of Dr. Dan Russell, Kettering University
Transverse Waves Animation courtesy of Dr. Dan Russell, Kettering University
Forces in a fragment of the tight rope
Longitudinal Waves Animation courtesy of Dr. Dan Russell, Kettering University
Fala dźwiękowa czyli… rozchodzące się zagęszczenia i rozrzedzenia cząsteczek np. powietrza 6
Water Waves Animation courtesy of Dr. Dan Russell, Kettering University
Clockwise or anticlockwise? ? ?
Rayleigh surface waves Animation courtesy of Dr. Dan Russell, Kettering University
Długość, amplituda i prędkość fali
Jest fala – jest drganie!
Reflection from a HARD boundary Acoustics and Vibration Animations - Dan Russell, Kettering University
Reflection from a SOFT boundary Acoustics and Vibration Animations - Dan Russell, Kettering University
Odbicie fal (sprężystych) 14
As spherical wave expands, its radius increases and the wavefronts flatten. At very large distances, the wavefronts are quite flat and the disturbance resembles a plane wave. The phase of the disturbance is the same at all points on a wavefront. A wavefront is a surface of constant phase.
Sound waves are acoustic waves, with no electrical component. They are simply vibrations in the air, a physical pressure. "Audible sound is thus defined as a disturbance in the atmosphere whereby a form of wave motion is propagated from some source at a velocity of 1, 075 feet per second, the transmission being accomplished by alternating condensations and rarefactions of the atmosphere in cycles having a fundamental frequency ranging somewhere between 16 per second and 32, 000 per second. "
Measurement of Sound Intensity: power per unit area, or, rate at which energy transported by the wave flows through a unit area A perpendicular to the direction of travel of the wave
DOPPLER EFFECT
Observer moving towards stationary source:
Source moving towards stationary observer:
Efekt Dopplera http: //www. ionaphysics. org/ntnujava/Doppler. html
Source moving/observer at rest Source/observer moving Observer moving/source at rest
Efekt Dopplera dla ruchu źródła Zagęszczenie frontów falowych i wreszcie…
BUM!!! czyli przekroczenie bariery dźwięku
Applications Ø Ø Ø Other important applications of the Doppler Effect: Doppler Radar uses the doppler effect for electromagetic waves to predict the weather. The Doppler shift for light is used to help astronomers discover new planets and binary stars. Echocardiography - a medical test using ultrasound and Doppler techniques to visualize the structure of the heart. Radio Direction Finding Systems There is also an instrumental rock group called The Doppler Effect
Standing wave in pipes Superpozycja identycznych, przeciwbieżnych fal
Standing wave in strings
Standing wave in strings
Zdudnianie się fal
Rejestracja dudnień Detektor
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