The conversation between human and AI assistant.
How do we know that photons exist?
Can you tell me how we know that photons exist?
Sure! Photons are a basic particle of light, and we know they exist because of their observable effects on matter. When photons hit certain materials, they can cause electrons to be emitted, which we can measure or see. We can also see the effects of photons when we use them to create images, such as in photography.