As the title implies, here is a collection of typical photoelectric effect problems that physics learners need to be able to solve. They determine the amount of energy of a photon, the photons produced per second, the frequency required...

Think it takes expensive, sophisticated equipment to measure the speed of light? Think again. Outfit yourself with a simple handheld laser pointer, a protractor, and Jell-O, and you're ready to get started.

Kansas State University site explaining all aspects of LASERS. The site is set up as an online book with clickable chapters.

Theodore Maiman built the world's first operable laser. Ironically, Maiman's first paper announcing this momentous achievement, which many other scientists had been racing to complete themselves, was rejected. Since then, however, lasers...