Last year’s nobel prize went to three people who developed blue leds in 1990’s. red and green led’s were developed much earlier but none of the developers of red or green leds have won the nobel prize. this is partly because you need all three colors, red, green and blue to create white light. however, this statement is not fully correct, considering that some of the white leds use only blue leds encapsulated by a phosphor coated bulb to generate white light. can you make white leds out of red or green leds by utilizing phosphors? explain.

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.