Question

A laser signal is beamed towards a planet from earth and it's echo is received 680 seconds later. If distance of planet be 1.02 straight x 10 to the power of 11m, what is the speed of laser light ?

Answer 1

Answer:

radar signal is beamed towards a planet from the earth ... the distance . then s speed =2 x6.3 x10*10/7 =12.6 x10*10/ 7 ...

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Answer 2

x = c x t/2 ⇒ c = 2x/t = 2x 6.3 x 10/7 x 60 = 3 x 108m/s