How can light be both a particle and a wave? With characteristics of each, the idea of light can be confusing. A lesson in the Crash Course physics series introduces scholars to quantum mechanics and how scientists use it to understand...

How much energy does it take for an electron jump from chromium metal? Using a formula, the instructor describes the procedure for determining the wavelength of light needed for a specific metal to eject electrons. 

Different light has different energy! An informative video describes the photoelectric effect by describing the result of different wavelengths of light hitting metal. The instructor describes the threshold of releasing electrons as...