Primarily used for wave phenomena (radio, sound, light, etc.). In everyday contexts, it often refers to radio frequencies.
このラジオはFMの周波数に合わせてください。
Please tune this radio to an FM frequency.
音の高さは周波数で決まる。
The pitch of a sound is determined by its frequency.
I tuned the radio to the right frequency and listened to my favorite program.
Because this radio wave has a high frequency, its range is narrow.
We measured the frequency of the signal with a dedicated device.
We changed the frequency to avoid interference.
high frequency; HF
intermediate frequency; IF