Lectures on Physics has been derived from Benjamin Crowell's Light and Matter series of free introductory textbooks on physics. See the editorial for more information.... |
Home Vibration and Waves Vibrations Examples Frequency of a radio station | |
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Frequency of a radio station
Question: KLON's frequency is 88.1 MHz. What does this mean, and what period does this correspond to? Solution: The metric prefix M- is mega-, i.e. millions. The radio waves emitted by KLON's transmitting antenna vibrate 88.1 million times per second. This corresponds to a period of T = 1/f = 1.14x10 -8 s .
This example shows a second reason why we normally speak in terms of
frequency rather than period: it would be painful to have to refer to such
small time intervals routinely. I could abbreviate by telling people that
KLON's period was 11.4 nanoseconds, but most people are more familiar
with the big metric prefixes than with the small ones.
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Home Vibration and Waves Vibrations Examples Frequency of a radio station |