Question

The estimated fundamental frequency of the given sine wave is (in integer) _________ Hz.

Hint:

The fundamental frequency of a wave is the reciprocal of its time period.

Answer 1

Correct Answer: 20

The given sine wave has a time period \( T \) that can be determined from the graph. We observe the time taken for one complete oscillation, which is the distance between two consecutive peaks or troughs. From the graph, the time period \( T \) is approximately 0.05 seconds (the distance between two consecutive peaks). The fundamental frequency \( f \) is the reciprocal of the time period: \[ f = \frac{1}{T} = \frac{1}{0.05} = 20 \, \text{Hz}. \] Thus, the estimated fundamental frequency of the sine wave is \( \boxed{20} \, \text{Hz}.}