1-3: 1 SEE ANSWER
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Answer: D (0.0833)
Frequency refers to the number of occurrences of a periodic event per time and is measured in cycles/second. In this case, there are 10 cycles per 2 minutes (also known as 10 cycles per 120 seconds).
So the frequency is: f =10 cycles / 120 s = 0.0833 cycles/s
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