Alow-power college radio station broadcasts 10 w of electromagnetic waves.
part a
at what distance from the antenna is the electric field amplitude 2.0�10? 3v/m, the lower limit at which good reception is possible?
express your answer to two significant figures and include the appropriate units.

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.