The distance of nearest star from earth is 10^13 km. Calculate the time taken by a laser beam to return to earth after
reflection from the star.
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Explanation:
distance to the nearest star = 10^13 km = 10^16 m
speed of light =3×10^8 m/s
= 299792 km/s
total distance = 2×10^16 m
total time take = total distance / speed of light
= 2×10^16 / 3×10^8
= 6.66×10^7 s
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