Shortwave sunlight passes through Earth's atmosphere, where it strikes the surface and is converted into longer-wavelength radiation.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?

The items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element