Chapter 4.4, Problem 46IP

To determine

To find: the time taken by the light from earth to the moon.

Answer to Problem 46IP

the time taken by light is $1.152\times {10}^{11}$ seconds.

Explanation of Solution

Given information:

The speed of light is $3\times {10}^5$ kilometer per second and the distance between earth and moon is $3.84\times {10}^5$ kilometers.

Calculation:to find the total distance travelled by light, multiply the speed and distance,

  $\begin{array}{l}3\times {10}^5\left(3.84\times {10}^5\right)=11.52\times {10}^{10}\text{ [multiply]}\\ 3\times {10}^5\left(3.84\times {10}^5\right)=1.152\times {10}^{11}\text{ [move the decimal point 1 places]}\end{array}$

Thus, the time taken by light is $1.152\times {10}^{11}$ seconds.