1. a) How long does it take a beam of light, such as a radio signal, to travel from an Earth laboratory to a spacecraft on Mars, a distance of about 35,000,000 miles (56,000,000 km)?
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It takes 3.1112 mins to cover the distance.
Explanation:
Speed of light : 300,000 km / sec
Distance : 56,000,000 km
Time in secs : 56,000,000 / 300,000 = 186.6667 secs
Time taken in mins : 186.6667 / 60 = 3.1112 mins.
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