Question

A laser beam after reflection from moon's surface returns to earth after 2.6 seconds. Find the distance of the moon from the surface of earth

Answer 1

Answer:

S= vt

Speed of light = 3 * 10^8 m/s

S= vt/2 because 2.6 is both side time

S= (3*10^8)2.6/2

S= 1.3(3*10^8)

S= 3.9*10^8 m

Answer 2

Answer:

Concept:

A laser beam after reflection from moon's surface returns to earth after 2.6 seconds and to know the distance of the moon from the surface of earth.

Explanation:

The speed of light ,c=3×$10^{8}$m/s

t=2.6s

∴d=$\frac{c\times t}{2}$

=$\frac{3\times 10^{8}\times 2.6}{2}$

=$\frac{7.8\times 10^{8}}{2}$

=3.9×$10^{8}$m

=3.9×$10^{5}$km

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