A radar sends an electromagnetic signal of electric field (E 0 ) = 2.25 V/m and magnetic field (B 0 ) = 1.5 x 10 -8 T which strikes a target on line of sight at a distance of 3 km in a medium. After that, a pail of signal (echo) reflects back towards the radar vitli same velocity and by same path. If the signal was transmitted at time t 0 from radar, then after how much time echo will reach to the radar?
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B
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