6. (a) Suppose the earth is revolving round the sun in a circular orbit of radius one b astronomical unit (1.5% 10 km). Find the
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Speed of light is given as
time interval is given as
so the distance covered by the light is given as
now as we know that
so the distance moved by light is
now for the comparision of this distance with diameter of earth
as we know that radius of earth is
so the diameter of earth will be
now the ratio of diameter with the distance that light move will be
<em>so it is 2.35 times more than the diameter of earth</em>