Question

A laser beam from Earth is reflected back from a mirror on the Moon in 2.60 s. If the distance between Earth and the Moon is 3.85 × 108 m, calculate the speed of light.

Answer 1

`\text{speed}=2.96*\text{ }10^8\text{ }\frac{\text{m}}{s}`

Step-by-step explanation

the speed of an object is given by:

`\text{speed}=\text{ }\frac{dis\tan ce}{\text{time taken}}`

then

Step 1

Let

`\begin{gathered} \text{Time}=2.6\text{ s} \\ \text{distance}=\text{ 2(}3.85*10^8)=7.7*10^8 \end{gathered}`

Now, replace

`\begin{gathered} \text{speed}=\text{ }\frac{dis\tan ce}{\text{time taken}} \\ \text{speed}=\text{ }\frac{7.7*10^8\text{ m}}{2.6\text{ s}} \\ \text{speed}=2.96*\text{ }10^8\text{ }\frac{\text{m}}{s} \end{gathered}`

so, the answer is

`speed_c=2.96*\text{ }10^8\text{ }\frac{\text{m}}{s}`

I hope this helps you