What are two ways that friction can be used of structure?

What is the relationship between absorbance of light and the rate of photosynthesis?

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

Amines amides and amino acids are categories of