Final answer:
The term used when frequencies are boosted at the cut-off is 'cut-off frequency'. When frequencies are boosted at the cut-off, it means that the frequencies are increased to a certain threshold where the photoelectric effect is observed. Below the cut-off frequency, the photoelectric effect is not observed.
Step-by-step explanation:
The term used when frequencies are boosted at the cut-off is 'cut-off frequency'.
When frequencies are boosted at the cut-off, it means that the frequencies are increased to a certain threshold where the photoelectric effect is observed. Below the cut-off frequency, the photoelectric effect is not observed.
For example, in the context of the photoelectric effect, when incident radiation has a frequency below the cut-off frequency, the photoelectric effect is not observed.