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Chapter 24: Q20CQ (page 887)

Give an example of energy carried by an electromagnetic wave.

Short Answer

Expert verified

An example is the microwave oven.

Step by step solution

01

Define electromagnetic waves

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

02

Explanation

Electric and magnetic fields both contribute to the energy of an electromagnetic wave.

Microwave ovens are a basic illustration of energy transported by an electromagnetic wave since the energy produced by the microwave oven is utilized to heat food stored within it. As a result, heat energy is generated here.

Therefore, an example is the microwave oven.

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Most popular questions from this chapter

Consider electromagnetic fields produced by high voltage power lines. Construct a problem in which you calculate the intensity of this electromagnetic radiation in W/m2 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渭罢 .

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渭罢 fields at distances of tens of meters.

(a) What is the wavelength of 100 MHz radio waves used in an MRI unit? (b) If the frequencies are swept over a 卤1.00range centered on 100MHz , what is the range of wavelengths broadcast?

Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. (a) How far away is the planet Venus if the echo time is 1000 s ? (b) What is the echo time for a car 75.0 m from a Highway Police radar unit? (c) How accurately (in nanoseconds) must you be able to measure the echo time to an airplane 12.0 km away to determine its distance within 10.0 m ?

Some radar systems detect the size and shape of objects such as aircraft and geological terrain. Approximately what is the smallest observable detail utilizing\(500{\rm{ }}MHz\)radar?

The maximum magnetic field strength of an electromagnetic field is \(5.00 \times {10^{ - 6}}\;T\). Calculate the maximum electric field strength if the wave is traveling in a medium in which the speed of the wave is \(0.75{\rm{ }}c\).
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