Chapter 23, Problem 72GP

To determine

We must find how much time the reflected Sunlight from the Moon would take to reach us (as we are on Earth).

Answer to Problem 72GP

Solution:

We know that distance between us (Earth)and Moon is 3∙844×10⁸ m

Speed of light in space is 2∙99×10⁸ m/s

Explanation of Solution

Here is the explanation of the solution

Given:

Sunlight is being reflected from the Moon and reflected sunlight is reaching us on Earth. So reflected light is travelling a distance which is equal to the distance between Moon and Earth. Speed of light we know in space is 2∙99×10⁸ m/s.

Formula used:

$\text{Time}=\text{distance}/\text{speed}$

Calculation:

As we know Time=Distance/Speed

$\text{Time}=\left(\text{3}\text{.844}\times \text{1}{0}^{\text{8}}\text{m}\right)/\left(\text{2}\text{.99}\times \text{1}{0}^{\text{8}}\text{m}/\text{s}\right)=\text{3}\text{.844}/\text{2}\text{.99 s}=\text{1}\text{.2856 s}$