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Question

A RADAR sends a signal to an aeroplane at a distance 300 km away, with a speed of 3×108 m s1. After how much time is the signal received back after reflecting from the aeroplane?


Solution

Total distance travelled by the aeroplane =2  × 300km =600 km =600000m
given speed of light = 3×108 m s1.

hence time taken  =fraction numerator d i s tan c e space t r a v e l l e d over denominator s p e e d space o f space l i g h t end fraction equals fraction numerator 6 x 10 to the power of 5 over denominator 3 cross times 10 to the power of 8 end fraction equals 2 cross times 10 to the power of negative 3 end exponent s e c o n d s


Physics
Concise Physics
Standard X

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