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JEE PHYSICS MCQ: COMMUNICATION SYSTEMS

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A radar sends an electromagnetic signal of electric field (E0)=2.25  V/m\left( {{E_0}} \right) = 2.25\,\,V/m and magnetic field (B0)=1.5 ×10−8T\left( {{B_0}} \right) = 1.5\, \times {10^{ - 8}}T which strikes a target on line of sight at a distance of 3 km in a medium. After that, a part of signal (echo) reflects back towards the radar with same velocity and by same path. If the signal was transmitted at time t=0t = 0 from radar, then after how much time echo will reach to the radar?
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Correct option: B
4.0×10−5s4.0 \times {10^{ - 5}}s
Option B (4.0×10−5s4.0 \times {10^{ - 5}}s) is correct because the time taken for the echo to return is calculated by considering the distance and the velocity of the electromagnetic signal in the medium.

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