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Chapter 31: Q. 14 (page 901)
The magnetic field of an electromagnetic wave in a vacuum is , where is in and is in s. What are the wave's (a) wavelength, (b) frequency, and (c) electric field amplitude?
a.Wave length of EM wave is.
b.Frequency of EM wave is.
c. Electric field amplitude of EM wave is.
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A rocket cruises past a laboratory at in the positive x-direction just as a proton is launched with velocity (in the laboratory frame) . What are the proton鈥檚 speed and its angle from the y-axis in (a) the laboratory frame and (b) the rocket frame?
Large quantities of dust should have been left behind after the creation of the solar system. Larger dust particles, comparable in size to soot and sand grains, are common. They create shooting stars when they collide with the earth's atmosphere. But very small dust particles are conspicuously absent. Astronomers believe that the very small dust particles have been blown out of the solar system by the sun. By comparing the forces on dust particles, determine the diameter of the smallest dust particles that can remain in the solar system over long periods of time. Assume that the dust particles are spherical, black, and have a density of . The sun emits electromagnetic radiation with power .
In reading the instruction manual that came with your garagedoor opener, you see that the transmitter unit in your car produces asignal and that the receiver unit is supposed to respond to a radio wave at this frequency if the electric field amplitude exceeds. You wonder if this is really true. To find out, you put fresh batteries in the transmitter and start walking away from your garage while opening and closing the door. Your garage door finally fails to respond when you're away. What is the electric field amplitude at the receiver when it first fails
3. If you curl the fingers of your right hand as shown, are the electric fluxes in FIGURE Q31.3 positive or negative?
What electric field strength and direction will allow the proton in FIGURE P31.30 to pass through this region of space without being deflected?
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