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### 26 Cards in this Set

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 2 Types of Energy Transfer Particle or Wave Single bump or disturbance that travels thru a medium Pulse <-> Longitudinal (Sound) ^ | v Transverse (Electromagnetic) require a medium mechanical high point crest low point trough max. distance object moves from equilibrium in any periodic motion amplitude shortest distance between points where the wave pattern repeats itself wavelength velocity of a wave constant time it takes the source to return to the same point in its oscillation period number of complete oscillations it makes each second frequency velocity of sound 343 m/s velocity of electromagnetic 3x10^8 m/s part is ___________ part is _________ transmitted; reflected change in direction of waves at the boundary between 2 different media refraction spreading of waves around a barrier diffraction result of the superposition of 2 or more waves interference how high or low the sound seems pitch frequency higher when object moving toward you, then it suddenly drops to a lower pitch as the sound moves away doppler effect greater _________, higher the _____ frequency; pitch What's the difference between a mechanical wave and an electromagnetic wave? Mechanical wave has to travel thru a medium or particle of some sort AM radio signals have wavelengths between 200m and 600m. FM signals have wavelengths about 3m. Why is an FM radio station received better in valleys and tunnels? It bounces up and down more than an AM signal. AM travels straight over mountains. If the pitch of a sound increases, what are the changes in: Frequency=? Wavelength=? Wave velocity=? Amplitude=? Up Down Nothing Nothing The speed of sound increases when air temperature increases. What happens to the Frequency=? Wavelength=? Nothing Up A firecracker produces a sound with intensity 90 dB. How many firecrackers would have to be exploded together to produce a 100 dB sound? +10dB=2x; 2 firecrackers