Question

How long does it take a message to travel from earth to a spacecraft at mars at its farthest from earth (about 400 million km)? express your answer to three significant figures and include the appropriate units. t =?

Answer 1

A message needs to be traveled to mars from earth. Distance between Earth and Mars (given) s = 400 million km
Speed of light = 3.00—10^5 km/ sec
We know Velocity = distance / time => time = distance / velocity
Time taken t = 400 million km / 3.00—10^5 = 400 x 10^6 / 3 x 10^5 = 1333.3 sec Time taken t = 22 min