415Hz
415Hz is a frequency value representing 415 cycles per second. As a pure tone it falls within the audible range for human hearing, with a wavelength of approximately 0.83 metres in dry air at 20 °C.
In electrical engineering 415Hz is a common intermediate frequency used for certain high‑voltage and medium‑voltage power
In music and acoustics 415Hz is sometimes employed as an alternative tuning standard. It is about 23 cents
Beyond power and music, 415Hz is occasionally used as a reference frequency in scientific experiments that
References to standards such as EN 500 and ISO 20060 contain detailed specifications on the 415Hz system,