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

Correct option is A

​$$\text{The general form of a sinusoidal waveform is } A\sin(\omega t + \phi), \text{ where } \omega \text{ is the angular frequency in radians per second.} \\ \text{The angular frequency } \omega \text{ is related to the frequency } f \text{ in Hz by the formula:}$$

$$\omega = 2\pi f$$

$$\text{Given } \omega = 6280 \text{ rad/s,}$$

$$f = \frac{\omega}{2\pi} = \frac{6280}{2\pi} \approx 1000 \text{ Hz}$$​​​​​