Solved Numerical Problem No. 1 ( Unit-1: Measurements ); HSSC-I (Class-11); Physics (Baluchistan Textbook Board, Quetta) With Verified Answers

How much distance is covered by light in one year when its speed in space is 3 ｘ 10⁸ m s⁻¹. Ans. (9.5 x 10¹⁵m) 

Given:

Time = t = 1 Year = 31536000 s = 3.154 ｘ 10⁷ s

Speed of Light = v = 3 ｘ 10⁸ m s⁻¹

To Find:

Distance traveled by Light in one year = S = ?

Solution:

The formula to calculate distance is

S = v ｘ t

by putting the corresponding values

S = 3.154 ｘ 10⁷ s ｘ 3 ｘ 10⁸ m s⁻¹

S = 9.462 ｘ 10¹⁵ m  ------------------Ans.

Similar Questions:

 A light year is the distance light travels in one year. How many metres are there in one light year: (speed of light = 3.0 x 10⁸ms⁻¹). (Ans: 9.5 x 10¹⁵m)

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