Calculating Distance Traveled by Light in 19.8 µs

[am08]

The speed of light is 3.00 x 108 m/s. How many miles will light travel in 19.8 µs? (One mile is 1.61 km.)

I don't even know where to start, any help would be appreciated.

 

[Doc Al]

What's the definition of speed?

 

[am08]

anyone? help!

 

[Doc Al]

Again: What does speed mean? (Hint: The units are meters/second.) How does speed relate to distance and time?

 

[am08]

speed is - distance/time

 

[Doc Al]

speed is - distance/time

Exactly! So distance = speed X time.

Use that to find out how many meters the light travels in that time. Then convert that answer to miles.

 

[am08]

thanks for your help doc, was easy enough :)