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