Radio Waves - NASA Science
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WHAT ARE RADIO WAVES? Radio waves have the longest wavelengths in the electromagnetic spectrum. They range from the length of a football to larger than our planet. Heinrich Hertz proved the existence of radio waves in the late 1880s. He used a spark gap attached to an induction coil and a separate spark gap on […]
nasa.gov2016年8月10日
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SOLVED: 1. In order to transmit information via radio waves, the wavesneed to be changed somehow. For car radios this can happen in twoways. For AM radios, which property of the carrier wave ismodulated before it is transmitted?A. amplitudeB. frequencyC. period2. For FM radios, which property of the carrier wave ismodulated before it is transmitted?A. amplitudeB. frequencyC. period
SOLVED: 1. In order to transmit information via radio waves, the wavesneed to be changed somehow. For car radios this can happen in twoways. For AM radios, which property of the carrier wave ismodulated before it is transmitted?A. amplitudeB. frequencyC. period2. For FM radios, which property of the carrier wave ismodulated before it is transmitted?A. amplitudeB. frequencyC. period
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