11) What type of wave has the highest frequency?
12) What is the principle behind a solar panel?
13) What is the unit for electric current?
14) What is the weakest fundamental force?
15) How many forces are there in nature?
16) What is the formula for the kinetic energy of an object?
17) What is the speed of light in a vacuum?
18) What is the formula for momentum?
19) What type of wave is light?
20) How many states of matter are there?