What distance does electromagnetic radiation travel in 21 µs?
What distance does electromagnetic radiation travel in 21 µs (microseconds)?
(2 significant figures) HINT: All electromagnetic radiation travels at the same speed, c=3.0*10^8.
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Use units to your advantage. What does 3.0 x 10^8 mean? miles per hour? light years per minute?
Actually, it's 3.0 x 10^8 meters/second. Well, now you have a time (21 microseconds) and a conversion factor (3.0x10^8 m/s). Just convert the given's units of time to the conversion factor's: there are 1x10^6 microseconds per second, so 21 microseconds = 21 x 10^6 seconds.
21 x 10^6 seconds x (3.0 x 10^8 meters/second) = 6.3 x 10^15 meters.