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What is the intensity of an electromagnetic wave with a peak electric field strength of 125V/m?

Short Answer

Expert verified

The intensity is20.74W/m2.

Step by step solution

01

Define electromagnetic waves

Electromagnetic waves are waves that are produced by changes in the electric and magnetic fields.

02

Evaluating the intensity of an electromagnetic wave

If one knows that the energy of every wave is proportional to the square of its amplitude, one may calculate the intensity as follows,

Iavg=cε0E022

Where Iavgis average intensity, is light speed,ε0is the permittivity of free space, and E0is maximum field strength.

Substitute the values in the above equation,

Iavg=3×108m/s8.85×10-12F/m125V/m22=20.74W/m2Therefore,theintensityis20.74W/m2.

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Most popular questions from this chapter

The 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 7.50μV/m. (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 1.50×1013m2(a large fraction of North America), how much power does it radiate?

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(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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