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At a distance of 25m from an isotropic 100 MHz radio source the intensity is 120W/m2.
A) What is the rms electric field at 25m?
B) What is the total power transmitted by the source?
C) Over a 2 hour period, what is the momentum given to a 4cm x 4cm surface (at the 25m distance) perpendicular to the source that reflects 3/4 of the energy?
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A train traveling at a constant speed sounds the whistle as it approaches a crossing and continues to sound the whistle for 100 meters past the crossing.
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