Question

Time taken by light to travel 230000000000

Answer 1

Speed of light in water =

μ

C

=

4/3

3×10

8

=

4

9

×10

8

m/s

Time taken =

speed

distance

=

4

9

×10

8

m/s

3×10

−2

m

=

3

4

×10

−10

sec

=1.333×10

−10

sec

Answer 2

8 seconds to reach on earth
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