: a) The photon energy of a CO2 laser is 0.117eV. Calculate the wavelength of the laser (for full points you need to show the used equations and calculation steps). b) The graph below shows the absorption as a function of wavelength for some metals. Can/ would you use the CO2 laser to weld aluminium? Motivate your answer. 0,30 0,25 0,20 Cu Al Stahl 0,15 + Fe 0,10 + 0,05 Mo 0,1 8 10 0,5 0,81 wave length 0,2 0,3 2 4 5 um 20

: a) The photon energy of a CO2 laser is 0.117eV. Calculate the wavelength of the laser (for full points you need to show the used equations and calculation steps). b) The graph below shows the absorption as a function of wavelength for some metals. Can/ would you use the CO2 laser to weld aluminium? Motivate your answer. 0,30 0,25 0,20 Cu Al Stahl 0,15 + Fe 0,10 + 0,05 Mo 0,1 8 10 0,5 0,81 wave length 0,2 0,3 2 4 5 um 20

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter12: The Solid State

Section: Chapter Questions

Problem 20P

See similar textbooks

Similar questions

The barium-yttrium ceramic compound used to demonstrate superconductivity will work only if supercooled to a temperature of 125 K. What is the equivalent temperature a) in °C? b) in °F?
The following (Attached image) is an external quantum efficiency of a CZTS solar cell with structure Glass/Mo/CZTS/CdS/AZO/Ag. The ideal QE curve would be a rectangle (red curve). The experimental QE is much less than the ideal one because of losses at different regions outlined 1, 2, 3 and 4. Please explain what are those losses.
The simple mass on a spring is the basis for our description of almost any oscillation. Lets consider the vibrational states of a simple diatomic molecule, say N2. We will model it as two identical masses connected by a spring as shown in the figure at the top right.This is a little different from the cart on a spring since there is no wall -- both of the atoms are moving. But if we only look at oscillations of the molecule where the center of mass is not moving, the atoms are moving equally and oppositely. When one is going left, the other goes an equal amount to the right and vice versa. This is like two carts attached to a wall and oscillating equally and oppositely as shown in the lower picture. The only difference is the way we treat the spring. When each atom moves a distance x, the spring between the atoms actually stretches a distance 2x, so the force on each atom is -2kx. We can therefore model the motion of one of the nitrogen atoms as a single cart on a spring if we…
Give only typing answer with explanation and conclusion The Einstein-A coefficient for a particular rovibrational transition of CO2 is 220 s−1. In the absence of collisions, what is the characteristic lifetime of the upper state? Compare this with the Na transition near 589.6nm which has an Einstein-A coefficient of 6.14×10^7 s−1.
The maximum wavelength of light that a certain silicon photocell can detect 1.11μm1.11μm.a. What is the energy gap (in electron volts) between the valence and conduction bands for this photocell?b. Explain why pure silicon is opaque.
choose the correct answer with Reason2- If a semiconductor of Eg is 2eV, the maximum wavelength of photons that can be detected by a photodiode is abouta. 620 nmb. 700 nmc. 740 nmd. 1240 nm
If the radius of a calcium ion is 0.19 nm, how much energy does it take to singly ionize it? Give your answer in electron-volts (eV) with precision 0.1 eV. Give your answer to 2 significant digits. (with step pls)
Sketch the diode load line on the characteristics curves given in Fig b., and determine operatingpoint.
Heat capacity and equipartition Find the classical physics prediction for the heat capacity of10 cm3of a substance which crystallises as FCC and has lattice constant 571 pm.
What is the band theory in solid-state physics and how does it explain the electrical conductivity of materials?
Calculate the surface density of the lattice atoms that lie on the (100) plane of a BCC crystal??? Please solve it quickly by handwritten
Titanium (ϕ = 6.94 ✕ 10−19 J) and silicon (ϕ = 7.24 ✕ 10−19 J) surfaces are irradiated with UV radiation with a wavelength of 250 nm. Which surface emits electrons with the longer wavelength? What is the wavelength of the electrons emitted by the titanium surface? Show work please