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Chapter 24: Q16PE (page 888)
If you wish to detect details of the size of atoms (about ) with electromagnetic radiation, it must have a wavelength of about this size. (a) What is its frequency? (b) What type of electromagnetic radiation might this be?
b. The electromagnetic radiation produced is X-ray
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Assume the helium-neon lasers commonly used in student physics laboratories have power outputs of 0.250mW. (a) If such a laser beam is projected onto a circular spot 1.00mm in diameter, what is its intensity? (b) Find the peak magnetic field strength. (c) Find the peak electric field strength.
Police radar determines the speed of motor vehicles using the same Doppler-shift technique employed for ultrasound in medical diagnostics. Beats are produced by mixing the double Doppler-shifted echo with the original frequency. If microwaves are used and a beat frequency of is produced, what is the speed of the vehicle? (Assume the same Doppler-shift formulas are valid with the speed of sound replaced by the speed of light.)
Consider electromagnetic fields produced by high voltage power lines. Construct a problem in which you calculate the intensity of this electromagnetic radiation in based on the measured magnetic field strength of the radiation in a home near the power lines. Assume these magnetic field strengths are known to average less than a .
The intensity is small enough that it is difficult to imagine mechanisms for biological damage due to it. Discuss how much energy may be radiating from a section of power line several hundred meters long and compare this to the power likely to be carried by the lines. An idea of how much power this is can be obtained by calculating the approximate current responsible for fields at distances of tens of meters.
(a) Calculate the range of wavelengths for AM radio given its frequency range is \(540\) to \(1600{\rm{ }}kHz\). (b) Do the same for the FM frequency range of \(88.0\) to \(108{\rm{ }}MHz\).
If electric and magnetic field strengths vary sinusoidally in time, being zeroat , then and . Let here.(a) When are the field strengths first zero? (b) When do they reach their most negative value? (c) How much time is needed for them to complete one cycle?
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