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Image Frequency

In receivers, the process of converting the desired RF frequency results in an undesired sensitivity at a second RF frequency, which is referred to as the image frequency. RF filtering in the receiver is relied upon to reduce to acceptable levels the receiver's susceptibility to spurious RF signals at the image frequency.

Frequency

In general terms, "frequency" is the rate (how often) at which something repeats. In acoustic terms, it is the rate at which sound Wavesrepeat over time. The greater the number of repeats, the higher the frequency. And the higher the frequency, the higher the pitch of the tone that is produced.