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.
1 Verify that the latest Java Runtime version is enabled by checking the Enabled box. 2  Click OK to save settings. 3  Click OK in Java Control Panel window to confirm changes and close the window. 4  Try to run same applet and verify it is now running using latest version of Java installed in your system.