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2: Frequency and Period Prelab–1 P RELAB : F REQUENCY AND P ERIOD I NTRODUCTION The frequency of a sound vibration is associated with its perceived pitch, and since pitch is one of the basic properties of sound, frequency is very important. This hand out will help you to understand the relationship between frequency and period , a related quantity. First, let’s have a quick review of frequency . F REQUENCY Frequency tells you how many events happen in a certain unit of time. As an example, try taking your pulse. That is, count the number of times you heart beats in one minute. Heartbeat rate = per minute This is a frequency, because it tells how many beats there are in one unit of time . The unit of time you used was the minute , which is customary for pulse measurements. In science, however, the second is the standard unit of time. Since there are 60 seconds in a minute, you will have to divide the number above by 60 to get your pulse in standard units. Heartbeat rate = per second Since a typical pulse is between 60 and 85 beats minute, your pulse in beats per second will probably be between 1.0 and 1.5. P ERIOD Anything that happens over and over again at a regular time interval is said to be periodic . This is because the event is characterized by a certain period of time , namely the period of time it takes for the repeating event to happen
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This note was uploaded on 01/20/2012 for the course P 109 taught by Professor Staff during the Fall '08 term at Indiana.

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