A space probe on the surface of Mars sends a radio signal back to the Earth, a distance of 9.75 multiplied by 107 km. Radio waves travel at the speed of light (3.00 multiplied by 108 m/s). How many seconds does it take for the signal to reach the Earth?|||time = distance / velocity = 9.75 x 10^7 km / 3.00 x 10^8 m/s = 9.75 x 10^10 m / 3.00 x 10^8 m/s = 325 seconds|||I'm answering this question by other method i did 2 days ago in my physics class.
As Radio signal has same speed as LIGHT. It takes 8.3Min to travel from sun to earth and 12.67min from sun to mars.
If you subtract 12.67-8.3= you get 4.37min( from earth to mars)
To convert this in to seconds, you do conversions.
(4.37min/1)(60sec/1min) CROSS MULTIPLY this, cancel out min.
Your answer will be 262.3sec .|||Your numbers are not correct. Earth and Mars are much farther apart, and light travels much more quickly than that.
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