# At what distance from a 27 mW point source of electromagnetic waves is the electric field...

## Question:

At what distance from a 27 mW point source of electromagnetic waves is the electric field amplitude 0.070 V/m?

## The Electromagnet Intensity:

Electromagnetic intensity is defined by the power that passes perpendicularly through a surface divided by the surface area under the spherically uniform radiation. It is also related to the energy density because the power is the total energy per unit time.

## Answer and Explanation: 1

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View this answerThe intensity *I* of the electromagnetic wave is defined by:

- {eq}I=\frac{P}{4\pi r^2}{/eq} where:

*P*(= 27 nW) is the power of the source*r*is the...

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Chapter 2 / Lesson 13Electric energy is acquired from the movement and transference of electrons. Learn the definition of electric energy, then discover its source in matter and atoms, explore the electron flow and its resistances, and then review examples of electric shock.

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