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Answer: The threshold frequency is specified as the lowest incoming radiation frequency below which photoelectric emission is absolutely impossible regardless of the strength of the incident radiation.
Threshold energy for particle creation is the kinetic energy that a pair of moving particles must have before they encounter. The threshold energy is always larger than or equal to a target particle’s rest energy. Because momentum is preserved in most circumstances, the threshold energy is substantially more than the rest energy of a target particle – and so there is still significant kinetic energy inside the final particles.
In radiation material science, the threshold energy is not to be confused with threshold displacing energy, which is minimal energy required to permanently displacement an atom inside a crystalline to generate a crystal defect.
