5. (a) A star is at a distance of 4.014 x 1010 km from the Earth. If the speed of light is 3 x 10 m/sec
then how long does it take for the light to travel from that star to the Earth.
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Step-by-step explanation:
distance = 4014 × 1010 km
speed = 3× 10 m / sec
covert m/ sec into km per hour
formula for converting = 3× 10 × 18/5
= 30 × 18/5
= 6× 18
= 108 km /h
we know speed = distance/ time
therefore Time = distance/ speed
= 4014× 1010/ 108
= 4054140 / 108
= 37538.333 hours
hope it helps
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