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.
LINK ==> SJI Joist Load Tables â 43rd Edition. Open-web steel joists, or bar joists or short span joists or long span joists (K series, KCS series, LH series, DLH series, SLH series) Joists, girders, and bridging are available in prime painted gray finish, uncoated, or galvanized. Joists and girders are available in one-piece design up to 120â²-0â³ before field bolted splicing would be required. SJI JOIST SUBSTITUTES: 2.5â³ Deep: 2.5JS1, 2.5JS2, 2.5K1, 2.5JS3, 2.5JS4, 2.5K2, 2.5JS5, 2.5JS6, 2.5K3, 2.5JS7.