The hyphae secrete digestive enzymes that break down the substrate, enabling the fungus to absorb the nutrients contained within the substrate. There are four major groups of fungi: Zygomycota, Ascomycota (sac fungi), Basidiomycota (club fungi), and Deuteromycota (fungi imperfecti).
You just need to count the number of crest (high points) if waves that like pass the fixed point 1 second or some other time period. The higher the number is man, the greater the frequency is, Hope this helps!