The cooler star, the most it is.
a) more luminous
b) more blue
c) redder​

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?