D. The frequency of the wave is determined 1.2 Hz.
What is frequency of a wave?
The frequency of a wave describes the number of waves that pass a fixed place in a given amount of time.
General wave equation;
y = A cos(ωt)
where;
- A is the amplitude of the wave
- ω is the angular frequency of the wave
From the given wave equation;
x(t) = 0.65 cos(7.4t)
ω = 2πf
7.4 = 2πf
f = 7.4/2π
f = 1.18 Hz
f = ≈ 1.2 Hz
Thus, the frequency of the wave is determined 1.2 Hz.
The correct option is D.
Learn more about frequency here: https://brainly.com/question/10728818
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