7. "The distance of a star from the earth is 8-33 light
minutes.' What do you mean by this statement ?
Express the distance in metre.
p.s the answer is 1.5*10¹¹metres I just want a step by step explanation
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Given:
The distance of a star from the earth is
8.33 light minutes means that
it takes 8.33 minutes for light to reach the earth
from the ultimate source of light -
the Sun. The distance is large, hence light year is used.
Speed of light = 3×10⁸ ms-¹
Time = 8.33 min = 499.8s
Distance = speed × time
= 3×10⁸ × 499.8
= 1.5 × 10¹¹m
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