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dreamer8987

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dreamer8987

electromagnetic waves

when electrons from a heated filament accelerate through a vacuum toward a positive plate, a) only an electric field will be produced b) only a magnetic field will be produced c) electromagnetic waves...
17:47 Thu 02nd Apr 20092 answers, last by ChuckFickens 22:22 Thu 02nd Apr 2009
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dreamer8987

electromagnetic waves

What would the speed of an observer be if a red (4.688x10^14 Hz) traffic light appeared green (5.555x10^14 Hz) to the observer?
17:43 Thu 02nd Apr 20091 answer, last by kempie 18:26 Thu 02nd Apr 2009
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dreamer8987

electromagnetic waves

electromagnetic waves are radiated uniformly in all directions from a source. The rms electric field of the waves is measured 35 km from the source to have an rms value of 0.42 N/C. Determine the...
17:40 Thu 02nd Apr 20091 answer, last by factor30 18:54 Fri 03rd Apr 2009
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dreamer8987

electromagnetic waves

the amplitude of the electric field component of and electromagnetic wave is increased from E to 4E. What is the corresponding change in the intensity of the wave? a) the intensity is unchanged by the...
17:38 Thu 02nd Apr 2009
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dreamer8987

electromagnetic waves

which statement is true concerning energy carried by electromagnetic waves? a) the energy is carried only by the electric field. b)more energy is carried by the electric field than by the magnetic...
17:36 Thu 02nd Apr 20091 answer, last by factor30 18:55 Fri 03rd Apr 2009

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