Chapter 24: Q30PE (page 889)
What is the intensity of an electromagnetic wave with a peak electric field strength of 125V/m?
Short Answer
The intensity is.
Chapter 24: Q30PE (page 889)
What is the intensity of an electromagnetic wave with a peak electric field strength of 125V/m?
The intensity is.
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Get started for freeThe rate at which information can be transmitted on an electromagnetic wave is proportional CZ the frequency of the wave. Is this consistent with the fact that laser telephone transmission at visible frequencies carries far more conversations per optical fiber than conventional electronic transmission in a wire? What is the implication for ELF radio communication with submarines?
An LC circuit containing a 2.00-Hinductor oscillates at such a frequency that it radiates at 1.00-m a wavelength. (a) What is the capacitance of the circuit? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
A 2.50-m -diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of . (See Figure24.28.) (a) What is the intensity of this wave? (b) What is the power received by the antenna? (c) If the orbiting satellite broadcasts uniformly over an area of (a large fraction of North America), how much power does it radiate?
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.)
(a) Calculate the ratio of the highest to lowest frequencies of electromagnetic waves the eye can see, given the wavelength range of visible light is from 380 to 760 nm . (b) Compare this with the ratio of highest to lowest frequencies the ear can hear.
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