radio and micro waves
TRANSCRIPT
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1. All sound waves are .A. longitudinal wavesB. transverse wavesC. electromagnetic wavesD. standing wavesE. loud
2. The speed of sound depends on .A. the temperature of the mediumB. the density of the mediumC. the type of mediumD. how well the medium will transfer energyE. All of the above
3. A sonar device can use echoes of ultrasound under water to find .A. the speed of soundB. the depth of the waterC. the temperature of the waterD. underwater objectsE. both B and D
4. During a thunderstorm, you see lightning before you hear thunder because . A. the thunder occurs after the lightningB. the thunder is farther away than the lightningC. sound travels faster than lightD. light travels faster than soundE. light travels in the form of a wave and sound does not
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ReviewReviewSound Pitch Loudness EchoResonance
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Electromagnetic SpectrumElectromagnetic Spectrum
EMS“light” from the sunMost of the EMS can not be
seen
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Electromagnetic SpectrumElectromagnetic Spectrum
Electromagnetic waves Do not require a medium Transverse waves
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Radio WavesRadio WavesLongest
wavelengthsLowest energy AM, FM, TV,
Shortwave
Can’t see
these!
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Radio WavesRadio WavesKeyless entryGarage door openers
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MicrowavesMicrowavesHigher energy than radio
wavesShorter wavelength
Can’t see
these!
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MicrowavesMicrowaves
Cooking
Can’t see
these!
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Cell PhonesCell PhonesUse wavelengths/frequencies
right on the dividing line between radio and micro waves
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In half-duplex radio, both transmitters use the same frequency. Only one person can talk at a time
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In full-duplex radio, the two transmitters use different frequencies, so both people can talk at the same time.Cell phones are full-duplex.
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