Energy of a photon : E = hf The photoelectric effect works like this. If you shine light of high enough energy on to a metal, electrons will be emitted from the metal. Light below a certain threshold frequency, no matter how intense, will not cause any electrons to be emitted.
The Boogie Board Jot 8.5 is an uber-slim slate with a black 8.5â³ screen. The stylus clicks into the opening under the screen. When you use the stylus it writes on the screen in a bright green color. The company claims this board is 50% brighter than their previous Jot model.
Unlike previous writing tablets from Improv Electronics, the Boogie Board Rip is the first from the company with the ability to easily save your work and upload it to a computer. The Rip is a simple and environmentally friendly solution for jotting down quick notes or momentary sparks of inspiration.