Fundamental frequency of the waveform 130 sin (6280t+30°) is:

Correct option is A

​$$\text{The general form of a sinusoidal waveform is } A\sin (\omega t + \phi), \text{ where } \omega \text{ is the angular} \\ \text{frequency in radians per second. The angular frequency } \omega \text{ is related to the frequency } f \text{ in Hz} \\ \text{by the formula:} \\\omega = 2\pi f \\\text{Given } \omega = 6280 \text{ rad/s,} \\f = \frac{\omega}{2\pi} = \frac{6280}{2\pi} \approx 1000 \text{ Hz}$$​​