Electrical DC Waveform Frequency

One wave per second is also called a Hertz Hz and in SI units is a reciprocal second s 1 . The variable c is the speed of light. For the relationship to hold mathematically, if the speed of light is used in m s, the wavelength must be in meters and the frequency in Hertz. So what would be frequency of DC waveform weather it's 0 HZ or more than 0 HZ up to 1 HZ Natvarbhai P Gajjar "Electrical DC Waveform Frequency" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-5 , August 2021, URL: https://www.ijtsrd.com/papers/ijtsrd45018.pdf Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/45018/electrical-dc-waveform-frequency/natvarbhai-p-gajjar