A laser beam after reflection from the surface of moon returns to earth after 2.6 s. What will be the distance of the moon from surface of earth. (given velocity of light in vacuum = 3 × 10⁸ m/s) *
(a) 3.9 ×10⁸ m
(b) 3.9 ×10-⁸ m
(c) 3.9 ×10¹⁰ m
(d) 3.9 ×10¹² m
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Answer:
t=2.56s
∴ t = time taken by laser beam to go to the moon =
t
2
distance between earth and moon
=d=c×
t
2
=3×108×
2.56
2
=3.84×108m.
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