Chapter 10: Waves The Test. Types of Waves: Surface Waves. Wave concepts. Types of Waves: Compression Waves. Types of Waves: Compression Waves
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1 Chapter 10: Waves The Test Average score: 25/ Multiple Choice Scores Frequency Did you read chapter 10 before coming to class? A. Yes B. No Wave concepts Waves are a disturbance that travels (usually through a material). They carry energy away from a source. The disturbance and associated energy move along, the material does not. Types of Waves: Surface Waves Types of Waves: Compression Waves Come from compressing atoms (or molecules) close together and then pulling them apart The oscillations are parallel/antiparallel to the direction of travel Types of Waves: Compression Waves Compression waves can travel through solids and fluids Solid Liquid Gas 1
2 Types of Waves: Transverse waves The oscillations in a transverse wave are perpendicular to the direction of travel Mechanical transverse waves (shear waves) require rigid bonds, so they only travel through solids Wave Properties: Wavelength Wavelength is the distance between two similar parts of the wave Compression Wave Transverse Wave Wave Properties: Amplitude Amplitude is the amount of displacement from the rest position Associated with the energy of the wave loudness (sound) brightness (light) Wave Properties: Frequency Frequency is the number of wave crests which pass a point per second. sound: pitch, 20 to 20,000 Hz light: color, Hz earthquake: 10 to 1,000 Hz radio: khz (AM) to MHz (FM) Amplitude Wave Properties: Speed Speed = frequency wavelength Speed usually depends almost exclusively on the medium. However, frequency/wavelength can play an extremely minor role in special cases. This is how we get rainbows Wave Properties: Speed The speed of sound is 340 m/s (about 1/5 mile/sec) The speed of light is 3x10 8 m/s You hear the thunder five seconds after seeing the lightning. How far away is the lightening? 2
3 If you double the frequency of a wave, the speed will a) Double b) Be cut in half c) Remain essentially unchanged Sound A compression wave in a fluid (air, water, etc). Long wavelength, low frequency low pitch Short wavelength, high frequency high pitch Talking Outboard Propeller whine Speed = frequency wavelength. Visible Light A transverse wave (but what is waving?) Long wavelength, low frequency red light Short wavelength, high frequency blue light Speed is the same for all colors in vacuum/air. Small dependence on color in dense material like water/glass Wave Behavior All waves will Reflect Refract Diffract Interfere Reflection Refraction The bending of a wave as it enters a medium with different properties so that the wave speed changes. 3
4 Bonus Material: Mirages are due to refraction Bonus Material: Mirages are due to refraction Diffraction The wave fans out when it encounters an obstacle or opening. The amount of diffraction depends on relationship between wavelength and size of opening: most when wavelength is similar to opening small when wavelength is much smaller than opening. Interference When two or more waves meet. constructive interference: two crests add together destructive interference: crest and trough cancel Standing waves Points of the medium that are permanently at rest are called Nodes Points of the medium that have maximum oscillation are called Anti-Nodes Only certain frequencies produce standing waves in a given system. These are called resonance frequencies. The energy of a wave is associated with its frequency. We can create one dimensional standing waves using a rope: Higher Dimensions Standing waves are possible in two dimensions as well antinodes nodes No good. No standing wave will form. 4
5 The Doppler Effect When the source and/or the observer are in motion relative to one another, the observed frequency can change. If the source and observer are moving towards each other, frequency increases If they are moving apart, frequency decreases Bonus material: Shock waves If a source is moving faster than the speed of the wave, shock waves form. 5
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