What is the best explanation for why copper does not appear shiny in the dark? O In the dark, there are no photons available to move an electron across the large band gap and make the metal appear shiny. O Metals are shiny because they reflect light, but in the dark there is no light to reflect. Metals are shiny because they absorb and re-emit photons, but in the dark, there are no photons to absorb. Only photons of light with enough energy to eject an electron will cause a metal to appear shiny, and in the dark there are no photons above that threshold.

What is the best explanation for why copper does not appear shiny in the dark? O In the dark, there are no photons available to move an electron across the large band gap and make the metal appear shiny. O Metals are shiny because they reflect light, but in the dark there is no light to reflect. Metals are shiny because they absorb and re-emit photons, but in the dark, there are no photons to absorb. Only photons of light with enough energy to eject an electron will cause a metal to appear shiny, and in the dark there are no photons above that threshold.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter8: Molecules And Materials

Section: Chapter Questions

Problem 8.97PAE: 8.97 The doping of semiconductors can be done with enough precision to tune the size of the band gap...

See similar textbooks

Similar questions

8.97 The doping of semiconductors can be done with enough precision to tune the size of the band gap in the material. Generally, in order to have a larger band gap, the dopant should be smaller than the main material. If you are a materials engineer and need a semiconductor that has lower conductivity thin pure silicon, what clement or elements could you use as your dopant? (You do not want either an n- or a p- type material) Explain your reasoning.
The figure to the right shows sunlight intensity as a function of wavelength. Answer the following questions about materials that could act as the absorber (p-type semiconductor) in a heterojunction solar cell. a.What advantage would there be in using a 1000-nm wavelength bandgap absorber vs. one that had a 400-nm wavelength bandgap? (HINT: the bandgap is the minimum energy required to promote electrons.) b. One reason the electron-volt (eV) is often used as the bandgap unit in solar cell research is that the bandgap in eV is also equal to the maximum voltage that can be generated by the solar cell. With this in mind, what advantage would there be in using a 400-nm wavelength bandgap absorber vs. one that had a 1000-nm wavelength bandgap? c.In light of your answers to (a) and (b), can there be one “best” bandgap to use in a solar cell?
Transparent materials, such as some glasses, do not absorb any visible light. Why?
Chemistry how can i get its atomic surface density at (111) plane? (si-diamond structure or GaAs structure)
The crystalline solid, GaAs, has many applications in optoelectronics. The HOMO-LUMO electron band gap in crystalline GaAs is 1.52 eV. What is the wavelength (in nm) of a photon having this same energy?
Answer the following questions with drawing the atom configurations of the plane or direction. Express your final results in terms of the atomic radius, R. a. Calculate the linear density for the [111] direction in a BCC structure.b. Calculate the linear density for the [111] direction in a FCC structure.c. What is the planar density for the (110) plane in a BCC structure?d. What is the planar density for the (110) plane in a FCC structure
A solid is thought to have an orthorhombic structure. Calculate the positions D and 2θ for the plane 111 expected in the diffraction pattern as a result of CuKa radiation(λ=1.54 Å), since the edges of the unit cell are a= 3.50 Å, B=4.0 Å, C=5.5 Å.
The surface energy of a single crystal depends on crystallographic orientation. Does this surface energy increase or decrease with an increase in planar density? Why?
Which of the following is not an optical property of solid materials? Single choice. a. Polarization b. Transmittance c. Response to magnetic field d. Absorption e. All of the above are optical properties of solid materials
Below, two x-ray diffraction patterns obtained from two samples of the same material, but different crystal sizes are given. Which of the two (the top or the bottom one) has a smaller crystal size? On what feature of these XRD patterns are you basing your answer? Explain in detail how this feature of the XRD pattern indicates crystal size
Based on the volumes calculated in the previous question and the picture below, calculate the edge length, a, of the body-centered cubic cell, in pm, for each met Volumes: Cr - 2.28 x 10^-29m^3 Mo - 3.17 x 10^-29m^3 W - 3.15 x 10^-29m^3
The largest molecule for which a diffraction pattern has been observed is buckminsterfullerene, C60 (this is an allotrope of carbon in which the atoms are arranged in a pattern similar to that of a soccer ball). The diffraction pattern suggested a molecular wavelength of 2.5 pm. What was the velocity of the fullerenes?