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Chapter 24: Q40PE (page 889)
What capacitance is needed in series with an inductor to form a circuit that radiates a wavelength of ?
The capacitance is
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Find the frequency range of visible light, given that it encompasses wavelengths from \(380\) to \(760nm\)?
(a) What is the wavelength ofradio waves used in an MRI unit? (b) If the frequencies are swept over arange centered on, what is the range of wavelengths broadcast?
Suppose the maximum safe intensity of microwaves for human exposure is taken to be . (a) If a radar unit leaks 10.0 Wof microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. (b) What is the maximum electric field strength at the safe intensity? (Note that early radar units leaked more than modern ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.)
An AM radio transmitter broadcasts 50.0 kw of power uniformly in all directions. (a) Assuming all of the radio waves that strike the ground are completely absorbed, and that there is no absorption by the atmosphere or other objects, what is the intensity 30.0 km away? (Hint: Half the power will be spread over the area of a hemisphere.) (b) What is the maximum electric field strength at this distance?
Your friend says that more patterns and colors can be seen on the wings of birds if viewed in ultraviolet light. Would you agree with your friend? Explain your answer.
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