MCQ
The frequency of the sinusoidal wave $y=0.40 \cos [2000 t+0.80 x]$ would be
- A$1000 \pi \mathrm{Hz}$
- B$2000 \mathrm{~Hz}$
- C$20 \mathrm{~Hz}$
- ✓$\frac{1000}{\pi} \mathrm{Hz}$
✓
Answer
Correct option: D.
$\frac{1000}{\pi} \mathrm{Hz}$
(d) Compare the given equation with $y=a \cos (\omega t+k \phi)$$\Rightarrow \omega=2 \pi n=2000 \Rightarrow n=\frac{1000}{\pi} H z$
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