Question

A radar sends a signal to an aeroplane at a distance 45 km away with a speed of 3 × 10 ^8 m/s. after how long is the signal received back from the aeroplane ?​

Answer 1

Explanation:

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Answer 2

Solution-

The signal received back from the aeroplane by the radar covers a total distance of $\sf{(45+45)km}$

i.e., $\sf{90\:km=90×{10^3\:m}}$

$\sf{speed\:of\:the\:signal=3×{10^8}m/s}$

$\sf{∴Time\:taken,t=\dfrac{90×{10^3}m}{3×{10^8}m/s}}$

$\sf\:\:\:\:\:\:\:\:\:\:\:={30×{10^-5}\:s.}$

$\sf\:\:\:\:\:\:\:\:\:\:\:=\bf{30×{10^-4}\:s.}$