Question

telephone companies now use light to send phone conversations over fiber optic cables. suppose you were talking to someone in asia, about 7,500 miles away. how long would it take the light signal to get there? a 0.04 seconds b 40 seconds c 0.025 seconds d 24.8 seconds

Explanation:

Step1: Recall speed - distance - time formula

The speed of light in a vacuum is approximately $186000$ miles per second. The formula for time $t$ is $t=\frac{d}{v}$, where $d$ is distance and $v$ is speed.

Step2: Substitute values into formula

We have $d = 7500$ miles and $v=186000$ miles per second. So $t=\frac{7500}{186000}\approx0.04$ seconds.

Answer:

A. 0.04 seconds