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14. Before LEDs were affordable, no one ever had blue Christmas lights, but now you see them everywhere. They often use
Posted: Wed May 04, 2022 3:24 pm
by answerhappygod
- 14 Before Leds Were Affordable No One Ever Had Blue Christmas Lights But Now You See Them Everywhere They Often Use 1 (59.54 KiB) Viewed 41 times
14. Before LEDs were affordable, no one ever had blue Christmas lights, but now you see them everywhere. They often use a semiconductor material called gallium nitride (GaN) to produce the light. a. (3 points) The energy of the transition that produces the light, (called a "band gap in a semiconductor), is 5.35x10 J. What is the wavelength (in nm) of the photons emitted by a GaN LED? b. (2 points) Which aqueous solution would most effectively absorb the light emitted by the GaN LED? (just circle one) L 0.1 M NISO. (green) 0.1 M CuSO. (blue) v. 0.1 M FeCl (orange) 1.0 M NISO. (green) iv. 1.0 M CuSO. (blue) vi. 1.0 M Fech (orange) c. (2 points) The melting point of GaN is about 2800 K What types of bonds/forces need to be broken in order to melt GaN? d. (4 points) The elements that make up GaN, Ga and N., have melting points of 303 K and 63 K respectively. What types of bonds/forces need to be broken in order to melt solid Ga? What about solid N?