How did Albert Einstein explain the photoelectric effect? A-Light is made of photons
B-Light is made of atoms
C-Light is made of electricity
D-Light is made of electrons

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line