How long would it take a radiowave of frequency, 6 xx 10^(3) sec^(-1) to travel from Mars to the Earth, a distance of 8 xx 10^(7) km?

How long would it take a radiowave of frequency, 6 xx 10^(3) sec^(-1)

1.	How long would it take a radiowave of frequency, 6 xx 10^(3) sec^(-1) to travel from Mars to the Earth, a distance of 8 xx 10^(7) km?
Answer» Solution :All radiation in vacuum travel with the same speed, i.e., `3 XX 10^(8) MS^(-1)` Distance to be travelled from Mars to the EARTH `= 8 xx 10^(7) km = 8 xx 10^(7) xx 10^(3) m (1 km = 10^(3) m)` `:.` Time taken `= (8 xx 10^(7) xx 10^(3))/(3 xx 10^(8)) = 2.66 xx 10^(2) SEC = 4` min 26 sec