What frequency of an electromagnetic wave having a wavelenght of 300,000km?

As we know the relationship between frequency, wavelength and wave speed , we can infer that : -

Terms in the formula

[ v of all electromagnetic waves is 3 × 10⁸ m/s]

Time to find the frequency : -

the average speed is 24.57 km/hr

so here is the information for current research:

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