the first Question the second question A source of sinusoidal electromagnetic wa

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the first Question

the second question

A source of sinusoidal electromagnetic waves radiates uniformly in all directions. At 9.10 m from this source, the amplitude of the electric field is measured to be 3.05 N / C. What is the electric field amplitude at a distance of 22.8 cm from the source? 39.912 times N / C Two square reflectors, each 2.65 cm on a side and of mass 4.25 g, are located at opposite ends of a thin, extremely light, 1.00 - m rod that can rotate without friction and in a vacuum about an axle perpendicular to it through its center (see figure below). These reflectors are small enough to be treated as point masses in moment-of - inertia calculations. Both reflectors are illuminated on one face by a sinusoidal light wave having an electric field of amplitude 1.45 N / C that falls uniformly on both surfaces and always strikes them perpendicular to the plane of their surfaces. One reflector is covered with a perfectly absorbing coating, and the other is covered with a perfectly reflecting coating. What is the angular acceleration of this device? 1.06e - 12 times rad / s 2

Explanation / Answer

I know only how to solve the first solution.....

i dont know how to solve the second solution...

E1 = 3.05 N/C

R1 = 9.1 m

R2 = 0.228

using the formulae

E1/E2=R2/R1

we ve

E2 = 3.05*9.1/0.228 = 121.7324 N/C

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