system
Given the following post, respond as if you're commenting on Reddit:
human
When we speak of the wave length of light is that just a metaphor?

I know that light doesnt behave like a wave or like tiny marbles but it is sometimes useful to describe it in those terms. Similarly,is the term "wave length" just a helpful but not completely accurate metaphor or is it actually an accurate description?
gpt
It is an accurate description for when you are dealing with many photons.  When you are dealing with one or few, photons and quantum mechanics are needed, but when you are dealing with a large number of photons, it is generally easiest to treat the light as a classical wave.

So, you'll find scientists using wavelengths and classical physics to describe light in almost every field except for some areas of physics, chemistry, and astronomy.