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Question

Light travels with a speed of 3 × 108 m/s in vacuum. Sunlight takes 8.3 minutes to reach the earth. Calculate the distance between the earth and the sun.


Solution

 Given:  Speed of light =3×108 m/s Time taken by light to reach the earth=8.3 minutes      8.3 minutes=8.3×60 s                        =498 sSpeed=DistanceTimeDistance =Speed × TimeDistance =3×108 m/s ×498 s                =1494 ×108 mThus, the distance between the sun and the earth is (1494×108) m.

Science
Everyday Science
Standard VIII

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