Description
A space probe on the surface of Mars sends a radio signal back to the Earth, a distance of 9.90 ✕ 107 km. Radio waves travel at the speed of light (3.00 ✕ 108 m/s). How many seconds does it take for the signal to reach the Earth?
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Explanation & Answer
3.00 x 10^8=300,000,000ms
convert into km
i km=1000m
? =300,0000,000m
300,000km
distance between mars and earth=99,000,000km
1 sec waves travel 300,000km
99,000,000/300,000
=330sec
=5 mins 30 secs
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