Chapter 16, Problem 37A

To determine

To Find:Distance between earth and moon

Answer to Problem 37A

  $3.84\times {10}^8 \text{m}$ .

Explanation of Solution

Given:

Light take $t=$ 1.28 s to travel from earth to moon.

The speed of light is $v=3\times {10}^8\text{m}\cdot {\text{s}}^{\text{-1}}$ .

Formula Used:

The expression for distance is

  $D=t\times v$  ...... (1)

Calculation:Substitute $3\times {10}^8\text{m}\cdot {\text{s}}^{\text{-1}}$ for $v$ and $1.28\text{s}$ for $t$ in equation (1),

  $\begin{array}{c}\text{D}=1.28 \text{s}\times 3\times {10}^8 \text{m}/\text{s}\\ \text{}\text{D}= 3.84\times {10}^8 \text{m}\end{array}$

Conclusion:

Hence, the distance between earth and moon is $3.84\times {10}^8 \text{m}$ .