What is theoretical physics used to explain?
natural phenomena.
Can it also predict things?
yes
What does it employ?
matematical models
What part of physics is it different from?
This is in contrast to experimental physics, which uses experimental tools to probe these phenomena.
What did Einstein develop?
an explanation of the photoelectric effect
What did he win for this?
the Nobel prize
What does a physical theory involve?
it's a model of physical events/
What keeps a boat above water?
it displaces its mass of water
Who figured this out?
Archimedes
Did he also study musical tone?
Pythagoras understood the relation between thno