In science, frequency is the quantity of occurrences of a repeating event per unit of time. It is sometimes referred to as temporal frequency, to distinguish it from angular or spatial frequencies. However, the two terms are used interchangeably. Here's an example of a recurring event and how much frequency can be defined. To understand the difference between temporal and angular frequencies, consider how they are measured. If you're wondering what is frequency, think about how often the same thing happens to you.
The frequency of a particular sound or audio wave is also called pitch. A drum beat has a lower frequency than a bullfrog's call. In general, a higher-frequency sound will produce more oscillations. Human hearing can detect frequencies between 20 Hz and 20,000 Hz. High-frequency sounds are ultrasonic and are invisible to humans. Dogs are also capable of hearing ultrasonic frequencies. So, how can we make use of these signals to communicate?
Walkie-talkies are another type of family-band radios. Initially, these devices were made famous by Dick Tracy's cartoons, but have been popularized by the Motorola Talkabout in the 1990s. Although they've been largely phased out of the mainstream because of the proliferation of cell phones, walkie-talkies are enjoying a renaissance in the backcountry with BC Link radios from Backcountry Access. Unlike other licensed frequency bands, walkie-talkies operate in an open-space band. In addition, they can be crowded if not protected by privacy codes. For this reason, you should never share a frequency with a group that doesn't have permission.