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Chapter 31: Q. 18 (page 901)

A radio receiver can detect signals with electric field amplitudes as small as 300渭痴/m. What is the intensity of the smallest detectable signal?

Short Answer

Expert verified

Intensity of the smallest detectable signal is1.19532脳10-10W/m2.

Step by step solution

01

Formula for intensity

Intensity is,

I=12EoEo2c

E0is Electric field amplitude.

localid="1648922508504" c-Speed of the light in vacuum,

localid="1648922516996" c=3脳108m/s

02

Calculation for intensity of the signal

As it stands,

Eomin=300渭痴/m

c=3脳108m/s

I=12EoEo2c

localid="1648786141912">I=12300|300|2脳3脳108

I=1.19532脳10-10W/m2

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Most popular questions from this chapter

1. Andre is flying his spaceship to the left through the laboratory magnetic field of FIGURE Q31.1.

a. Does Andre see a magnetic field? If so, in which direction does it point?

b. Does Andre see an electric field? If so, in which direction does it point?

FIGUREP31.38shows the voltage across a 0.10mFcapacitor. Draw a graph showing the displacement current through the capacitor as a function of time.

The maximum electric field strength in air is 3.0MV/m. Stronger electric fields ionize the air and create a spark. What is the maximum power that can be delivered by a 1.0-cm-diameter laser beam propagating through air?

A cube of water 10 cm on a side is placed in a microwave beam having E0=11kV/m. The microwaves illuminate one face of the cube, and the water absorbs 80%of the incident energy. How long will it take to raise the water temperature by 50藲C?.Assume that the water has no heat loss during this time.

A rocket zooms past the earth at v=2.0脳106m/s. Scientists on the rocket have created the electric and mag-netic fields shown in FIGURE EX31.5. What are the fields measured by an earthbound scientist?
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