Very small semiconductor crystals, composed of approximately 1000 to 10,000 atoms, are palled quantum dots. Quantum dots made of the semiconductor CdSe are now being used in electronic reader and tablet displays because they emit light efficiently and in multiple colors, depending on dot size. The density of CdSe is 5.82 g/cm 3 a. What is the mass of one 2.5-nm CdSe quantum dot? b. CdSe quantum dots that are 2.5 nm in diameter emit blue light upon stimulation. Assuming that the dot is a perfect sphere and that the empty space in the dot can be neglected, calculate how many Cd atoms are in one quantum dot of this size. c. What is the mass of one 6.5-nm CdSe quantum dot? d. CdSe quantum dots that are 6.5 nm in diameter emit red light upon stimulation. Assuming that the dot is a perfect sphere, calculate how many Cd atoms are in one quantum dot of this size. e. If you wanted to make one 6.5-nm dot from multiple 2.5-hm dots, how many 2.5-nm dots would you need, and how many CdSe formula units would be left over, if any?
Very small semiconductor crystals, composed of approximately 1000 to 10,000 atoms, are palled quantum dots. Quantum dots made of the semiconductor CdSe are now being used in electronic reader and tablet displays because they emit light efficiently and in multiple colors, depending on dot size. The density of CdSe is 5.82 g/cm 3 a. What is the mass of one 2.5-nm CdSe quantum dot? b. CdSe quantum dots that are 2.5 nm in diameter emit blue light upon stimulation. Assuming that the dot is a perfect sphere and that the empty space in the dot can be neglected, calculate how many Cd atoms are in one quantum dot of this size. c. What is the mass of one 6.5-nm CdSe quantum dot? d. CdSe quantum dots that are 6.5 nm in diameter emit red light upon stimulation. Assuming that the dot is a perfect sphere, calculate how many Cd atoms are in one quantum dot of this size. e. If you wanted to make one 6.5-nm dot from multiple 2.5-hm dots, how many 2.5-nm dots would you need, and how many CdSe formula units would be left over, if any?
Very small semiconductor crystals, composed of approximately 1000 to 10,000 atoms, are palled quantum dots. Quantum dots made of the semiconductor CdSe are now being used in electronic reader and tablet displays because they emit light efficiently and in multiple colors, depending on dot size. The density of CdSe is 5.82 g/cm3
a. What is the mass of one 2.5-nm CdSe quantum dot?
b. CdSe quantum dots that are 2.5 nm in diameter emit blue light upon stimulation. Assuming that the dot is a perfect sphere and that the empty space in the dot can be neglected, calculate how many Cd atoms are in one quantum dot of this size.
c. What is the mass of one 6.5-nm CdSe quantum dot?
d. CdSe quantum dots that are 6.5 nm in diameter emit red light upon stimulation. Assuming that the dot is a perfect sphere, calculate how many Cd atoms are in one quantum dot of this size.
e. If you wanted to make one 6.5-nm dot from multiple 2.5-hm dots, how many 2.5-nm dots would you need, and how many CdSe formula units would be left over, if any?
a. Using the diagram below, draw arrows corresponding to the process of phosphorescence.
b. Briefly explain why emission by phosphorescence has longer wavelength than the absorbed wavelength.
S3
S2
V4
V3
V2
VI
Vo
T1
Vo
So
How many photons are contained in a burst of yellow light (589. nm) from a sodium lamp that has
609. kJ of energy?
3.06 x 1030 photons
1.81 x 1024 photons
2.48 x 1025 photons
4.03 x 1028 photons
3.37 x 10¹⁹ photons
1. What are the possible sets of quantum numbers that can describe a 2p electron in an atom?
2. Give the electron configuration of Be. Draw the orbital diagram.3. Give the electron configuration of B. Draw the orbital diagram
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell