Which term describes the ability of a receiver to discriminate between multiple signals?

Selectivity is the term that describes a receiver's ability to discriminate between multiple signals. This characteristic allows a receiver to isolate the desired signal from others that are operating on nearby frequencies, which is especially important in crowded frequency environments. A receiver with high selectivity can effectively differentiate between closely spaced signals, ensuring clear reception of the intended transmission without interference from other signals.

In contrast, tuning rate refers to how quickly a receiver can change frequency, which is not directly related to its ability to differentiate signals. Sensitivity relates to the minimum signal level a receiver can process, indicating how weak a signal can be while still being detectable. The noise floor is the level of background noise present in a system and does not pertain to the receiver's capacity to separate signals. Understanding these distinctions helps in evaluating the performance of radio receivers in practical situations.