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Chapter 24: Q11PE (page 888)
Electromagnetic radiation having a \(15.0\mu m\)wavelength is classified as infrared radiation. What is its frequency?
The frequency of the electromagnetic radiationis \(20{\rm{ }}GHz\).
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If you live in a region that has a particular TV station, you can sometimes pick up some of its audio portion on your FM radio receiver. Explain how this is possible. Does it imply that TV audio is broadcast as FM?
How do fluorescent soap residues make clothing look “brighter and whiter” in outdoor light? Would this be effective in candlelight?
A radar used to detect the presence of aircraft receives a pulse that has reflected off an object after it was transmitted. What is the distance from the radar station to the reflecting object?
Conversations with astronauts on lunar walks had an echo that was used to estimate the distance to the Moon. The sound spoken by the person on Earth was transformed into a radio signal sent to the Moon and transformed back into sound on a speaker inside the astronaut's space suit. This sound was picked up by the microphone in the space suit (intended for the astronaut's voice) and sent back to Earth as a radio echo of sorts. If the round-trip time was , what was the approximate distance to the Moon, neglecting any delays in the electronics?
(a) What is the wavelength of 100 MHz radio waves used in an MRI unit? (b) If the frequencies are swept over a range centered on 100MHz , what is the range of wavelengths broadcast?
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