Physics Review Question Unit: Waves Year: 1992 Question#: 35 Question: What is the period of a periodic wave that has the frequency of 60 hertz? (1 ) 1.7 x 10-2s (2 ) 2.0 x 104s (3 ) 3.0 x 10-3s (4 ) 3.3 x 102s What is this question really asking? Explanation by: Lindsay K [ Return to question menu ] Answer 1 1) 1.0 x 10-2s CORRECT Find the formula that deals with period (T) and frequency (f): T = 1/f So simply plug in the numbers: T = 1/f T = 1/60 hz T = .01666666s T = .017s in scientific notation that equals: 1 x 10-2s So this would be the correct answer. return to top Answer 2 2) 2.0 x 104s INCORRECT 2.0 x 104s is really 20,000s. If you plug 20,000s into the correct formula (T=1/f), you'll see that 20,000s DOES NOT = 1/60hz, it's way too big. return to top Answer 3 3) 3.0 x 10-3s INCORRECT 3.0 x 10-3s is really .003 s. If you use the correect formula (T = 1/f), you'll see that .003s DOES NOT = 1/60hz. It's way too small. return to top Answer 4 4) 3.3 x 102s INCORRECT 3.3 x 102s is really 330s. If you use the correct formula (T=1/f), you'll see that 330s DOES NOT = 1/60hz. It's too big. return to top What's this question really asking? Do you know how to use the period/frequency formula and how they relate? return to top |
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