characteristics of waves section 2 page 463-471 98
TRANSCRIPT
Characteristics of WavesSection 2
Page 463-471
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Wave properties
Transverse waves have the shape of a sine curve
If they have the shape of a sine curve they are called sine waves
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Know these parts of a transverse wave
Crest—highest part of the wave
Trough—lowest part of the wave
Wavelength—the distance between two crests
Amplitude—the height of the wave
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Amplitude measures the amount of particle vibration
The greatest distance that a wave is displaced from its normal resting place
Also, half the distance from crest to trough
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99Amplitude is related to loudness!
Wavelength
Measures the distance between two equivalent parts of the wave
Represented by the Greek letter lambda, λ
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Other important termsPeriod—how long it takes for waves to pass by Symbol is T SI Unit is seconds
Frequency –measures the rate of vibrations Symbol is f SI unit the hertz (Hz)
Frequency-Period Equation
Frequency = 1/period f=1/T 102
Radio Stations
Measure in
mHz—millions--FM
kHz—thousand—AM
95.1 T-95 classic rock, alternative
104.5 The FOX classic rock
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Electromagnetic Spectrum
Electromagnetic Spectrum
Radio—AM,FM, TV, radar aircraft navigation
Microwave—research and microwave ovens
Infrared—infrared photos, remote controls, heat radiation
Visible Light—ROYGBIV
UV light—sterilizing, fluorescent minerals, (sunburns)
X-ray—medical exams, cancer treatment
Gamma ray—food irradiation, studies of structural flaws 104
Radio waves have long wave lengths, so low frequency
Gamma rays have short wavelengths, so high frequency
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Visible light is only one small portion of the EM spectrum
Red has a long wave length
Violet has a short wavelength
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Speed of Sound340 m/sSound travels better in water
Sound travels even better in solids
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Speed of Light
3.00 x 108 m/s186,000 mi/s
Depends on the medium
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Pitch
Pitch is determined by
frequency High pitch = high
frequency Low pitch = low
frequency
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Doppler Effect
An observed change in the frequency of the wave when the source or observer is moving
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