The distance of a galaxy from the earth is of the order of 1... | PHYSICS - MEASUREMENT OF TIME | SolveeIt | Solveeit

Today, August 18

Question

The distance of a galaxy from the earth is of the order of 10²⁵ m. The time taken by light to reach the earth from the galaxy is

A

3 × 10¹⁴ s

B

3 × 10¹⁶ s

C

3 × 10¹⁸ s

D

3 × 10²⁰ s

Answer

3 × 10¹⁶ s

Explanation

Solution

Speed of light , $c = 3 \times 10^{8}ms^{- 1}$

Time taken by light to reach the earth form the galaxy is $t = \frac{10^{25}m}{3 \times 10^{8}ms^{- 1}} = 3 \times 10^{16}s$