A copper vapor pump laser used in an atomic experiment.
As science began to look at very small sizes down to the scale of an atom, our previous intuition about matter broke down. Quantum mechanics is the solution to what seemed like inconsistent behavior of atoms and light, that resolves dilemmas over what is a wave and what is a particle. Lasers create a precise wavelength due to quantum mechanics, and are increasingly found throughout everyday life. This chapter covers black body radiation and Planck's quantum hypothesis, photons and the photoelectric effect, and wave-particle duality.
2. The De Broglie equation for the wavelength of matter waves is