Metric

# Metric - 3 PRELAB METRIC UNIT PREFIX INTRODUCTION In this...

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3: Metric Unit Prefix Prelab–1 3: P RELAB : M ETRIC U NIT P REFIX I NTRODUCTION In this course it is often necessary to calculate frequencies by taking reciprocals of periods. Sometimes the period will be is units of seconds. With sound signals, however, the period will usually be in the millisecond range, and occasionally even the microsecond range. Many students have difficulty taking reciprocal of period which is in milliseconds. For example, they will write 1/(4.2 ms) = 0.24 Hz or even 0.24 mHz. This is not correct. Remember that 4.2 ms is shorthand for 4.2 x 0.001 s = 0.0042 s: 1 4.2 x 0.001 s = 1 0.0042 s = 238 Hz This homework will give you some practice take reciprocals of numbers which have prefixes like milli- and micro- on their units. You will need a calculator to do this homework. D EFINITIONS M = mega = x 10 6 = x 1,000,000 k = kilo = x 10 3 = x 1,000 m = milli = x 10 -3 = x 0.001 μ (or u) = micro = x 10 -6 = x 0.000001 P ROCEDURE Method 1 The most direct way to calculate a reciprocal is simply to write the number

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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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Metric - 3 PRELAB METRIC UNIT PREFIX INTRODUCTION In this...

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