Homework Answers
a)
In metals the conduction band and the valance band overlap each other and thus all the visible light will be absorbed and it is scattered by the free electrons in teh metal.
This gives the information of opaqueness of metals to visible light.
b)
The visible light is having energy of teh order of band gap of semiconductors.
Thus, it will be absorbed by teh semiconductors and help the electrons to jump from valance band to conduction band. Infrared light is having lesser energy when compared with the band gap of semiconductors. Thus, Infrared light will pass through the semiconductor.
c)
The visible light is having energy which is less than band gap of insulators. Thus, it willpass through the insulator.
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5) Use the notion of energy bands to explain the following optical properties of solids: (a)...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical conductivity between metals, semiconductors and insulators. Assume a pure solid with no impurities added and answer the following questions. ) What do the energy bands represent in a solid. (ii) What is the relationship between these bands in the solid and the quantum levels of electrons in an individual atom? (iii) Use sketches to show how the energy band structure of conductors, semiconductors and...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical conductivity between metals, semiconductors and insulators. Assume a pure solid with no impurities added and answer the following questions. (1) What do the energy bands represent in a solid. (ii) What is the relationship between these bands in the solid and the quantum levels of electrons in an individual atom? (ii) Use sketches to show how the energy band structure of conductors, semiconductors and...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical conductivity between metals, semiconductors and insulators. Assume a pure solid with no impurities added and answer the following questions. (i) What do the energy bands represent in a solid. (2) (ii) What is the relationship between these bands in the solid and the quantum levels of electrons in an individual atom ? (2)
14-5. Diamond has an energy gap of 5.5 eV and is transparent. Silicon has an energy gap of 1.1 eV and reflects all...
14-5. Diamond has an energy gap of 5.5 eV and is transparent. Silicon has an energy gap of 1.1 eV and reflects all visible light, making it look much like a metal. What optical properties would you expect of an insulator with an energy gap of about 2.5 eV?
14-5. Diamond has an energy gap of 5.5 eV and is transparent. Silicon has an energy gap of 1.1 eV and reflects all visible light, making it look much like a...
Week 7 The optical properties of nonmetallic materials depend strongly on their bandgap. Planck's...
Week 7 The optical properties of nonmetallic materials depend strongly on their bandgap. Planck's constant (เ) İSha4.135 x 10asevs and the speed oflight(c) is c 3x10"m/s. The wavelengths of light in the visible spectrum are: Violet light, A-04-0425pm Blue light, λ-0424-0.49μm Green light, λ-049-0.55μm Yellow light, λ :0.55-0.56μm Orange light, 2-0.56-0.65um Red light, 2 -0.65-0.7ym Question S a) What is the maximum bandgap that a material can have and remain fully opaque? What is the minimum bandgap a material can...
a) Is the energy absorption associated with bands in an infrared spectrum of higher or lower...
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As you may have learned when studying the properties of thermal energy, building contractors ofte...
As you may have learned when studying the properties of thermal energy, building contractors often install double-glazed windows to prevent thermal energy ("heat") from enteringlexiting the building Although effective as insulators, such windows present interesting optical effects In the figure, a double-glazed window comprises two identical panes of glass (ng- 1.54) separated by an air gap. If the light encounters the glass at an angle of 40.00° with respect to the glass, find the shift in path Δχ as the...
you may have learned when studying the properties of thermal energy, building contractors oftern nstall double-glazed windows to prevent thermal energy ("heať") from entering/exiting the buil...
you may have learned when studying the properties of thermal energy, building contractors oftern nstall double-glazed windows to prevent thermal energy ("heať") from entering/exiting the building Although effective as insulators, such windows present interesting optical effects In the figure, a double-glazed window comprises two identical panes of glass (ng- 1.46) separated by an air gap. If the light encounters the glass at an angle of 40.00° with respect to the glass, find the shift in path Ax as the light...
As you may have learned when studying the properties of thermal energy, building contractors often install...
As you may have learned when studying the properties of thermal energy, building contractors often install double-glazed windows to prevent thermal energy ("heat") from entering/exiting the building. Although effective as insulators, such windows present interesting optical effects. In the figure, a double-glazed window comprises two identical panes of glass (n_g = 1.46) separated by an air gap. If the light encounters the glass at an angle of 40.00 degree with respect to the glass, find the shift in path delta...
As you may have learned when studying the properties of thermal energy, building contractors ofte...
As you may have learned when studying the properties of thermal
energy, building contractors often install double-glazed windows to
prevent thermal energy (\"heat\") from entering/exiting the
building. Although effective as insulators, such windows present
interesting optical effects. In the figure, a double-glazed window
comprises two identical panes of glass (ng = 1.40) separated by an
air gap. If the light encounters the glass at an angle of 40.00°
with respect to the glass, find the shift in path Δx as...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical conductivity between metals, semiconductors and insulators. Assume a pure solid with no impurities added and answer the following questions. ) What do the energy bands represent in a solid. (ii) What is the relationship between these bands in the solid and the quantum levels of electrons in an individual atom? (iii) Use sketches to show how the energy band structure of conductors, semiconductors and...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical conductivity between metals, semiconductors and insulators. Assume a pure solid with no impurities added and answer the following questions. (1) What do the energy bands represent in a solid. (ii) What is the relationship between these bands in the solid and the quantum levels of electrons in an individual atom? (ii) Use sketches to show how the energy band structure of conductors, semiconductors and...
(a) The band theory of solids can be used to qualitatively explain the difference in electrical conductivity between metals, semiconductors and insulators. Assume a pure solid with no impurities added and answer the following questions. (i) What do the energy bands represent in a solid. (2) (ii) What is the relationship between these bands in the solid and the quantum levels of electrons in an individual atom ? (2)
14-5. Diamond has an energy gap of 5.5 eV and is transparent. Silicon has an energy gap of 1.1 eV and reflects all visible light, making it look much like a metal. What optical properties would you expect of an insulator with an energy gap of about 2.5 eV?
14-5. Diamond has an energy gap of 5.5 eV and is transparent. Silicon has an energy gap of 1.1 eV and reflects all visible light, making it look much like a...
Week 7 The optical properties of nonmetallic materials depend strongly on their bandgap. Planck's constant (เ) İSha4.135 x 10asevs and the speed oflight(c) is c 3x10"m/s. The wavelengths of light in the visible spectrum are: Violet light, A-04-0425pm Blue light, λ-0424-0.49μm Green light, λ-049-0.55μm Yellow light, λ :0.55-0.56μm Orange light, 2-0.56-0.65um Red light, 2 -0.65-0.7ym Question S a) What is the maximum bandgap that a material can have and remain fully opaque? What is the minimum bandgap a material can...
As you may have learned when studying the properties of thermal energy, building contractors often install double-glazed windows to prevent thermal energy ("heat") from enteringlexiting the building Although effective as insulators, such windows present interesting optical effects In the figure, a double-glazed window comprises two identical panes of glass (ng- 1.54) separated by an air gap. If the light encounters the glass at an angle of 40.00° with respect to the glass, find the shift in path Δχ as the...
you may have learned when studying the properties of thermal energy, building contractors oftern nstall double-glazed windows to prevent thermal energy ("heať") from entering/exiting the building Although effective as insulators, such windows present interesting optical effects In the figure, a double-glazed window comprises two identical panes of glass (ng- 1.46) separated by an air gap. If the light encounters the glass at an angle of 40.00° with respect to the glass, find the shift in path Ax as the light...
As you may have learned when studying the properties of thermal energy, building contractors often install double-glazed windows to prevent thermal energy ("heat") from entering/exiting the building. Although effective as insulators, such windows present interesting optical effects. In the figure, a double-glazed window comprises two identical panes of glass (n_g = 1.46) separated by an air gap. If the light encounters the glass at an angle of 40.00 degree with respect to the glass, find the shift in path delta...
As you may have learned when studying the properties of thermal
energy, building contractors often install double-glazed windows to
prevent thermal energy (\"heat\") from entering/exiting the
building. Although effective as insulators, such windows present
interesting optical effects. In the figure, a double-glazed window
comprises two identical panes of glass (ng = 1.40) separated by an
air gap. If the light encounters the glass at an angle of 40.00°
with respect to the glass, find the shift in path Δx as...
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