## anonymous one year ago What is the frequency of a wave having a period equal to 18 seconds? a. 6.6 × 10-2 hertz b. 5.5 × 10-2 hertz c. 3.3 × 10-2 hertz d. 1.8 × 10-2 hertz e. 8.0 × 10-3 hertz

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1. anonymous

who knows this?

2. Astrophysics

$f = \frac{ 1 }{ T }$ f is frequency, and T is period, do the rest.