Answer:
The output light frequency of a material before doubling depends on the specific material and the process being referred to.
If you are referring to a process like second harmonic generation (SHG), where a material is used to double the frequency of light, the output light frequency would be twice the input frequency. In this case, the output frequency is directly related to the input frequency by a doubling factor.
For example, if the input frequency is 100 THz (terahertz), the output frequency after doubling would be 200 THz.
It's important to note that the specific properties of the material and the details of the doubling process can affect the efficiency and exact output frequency achieved.
Step-by-step explanation: