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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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Give an example of interference of electromagnetic waves.
Approximately what is the smallest detail observable with a microscope that uses ultraviolet light of frequency \(1.20 \times {10^{15}}{\rm{ }}Hz\)?
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?
An LC circuit containing a capacitor oscillates at such a frequency that it radiates at a \({\rm{300 - nm}}\)wavelength. (a) What is the inductance of the circuit? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
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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