Question

a wave with a period of $\frac{1}{3}$ second has a frequency of
a) 67 hz.
b) 3 hz.
c) 300 hz.
d) 33 hz.

Explanation:

Step1: Recall frequency-period relation

Frequency $f = \frac{1}{T}$, where $T$ is period.

Step2: Substitute given period value

$T = \frac{1}{3}\ \text{s}$, so $f = \frac{1}{\frac{1}{3}}$

Step3: Calculate the frequency

$f = 3\ \text{Hz}$

Answer:

B) 3 Hz.