Physics for Science and Engineering With Modern Physics, VI - Student Study Guide
4th Edition
ISBN: 9780132273244
Author: Doug Giancoli
Publisher: PEARSON
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Chapter 40, Problem 48P
To determine
Find the wavelength at which the LED
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(ii) (a)
Show that the emission linewidth Aλ of an LED is given
approximately by
2kT2²
Δλ =
coh
where > is the wavelength and I is the absolute temperature in Kelvin.
You should clearly state any approximations made.
(b)
Estimate A for an LED operating at λ = 1.3 µm and at 27 °C.
(i) At room temperature a pure crystal has electron and hole concentration n=p=n,-1.5 10 cm, and electron and hole
drift mobilities, Po=1350 cm'Ns, P 450 cm2/Vs. Calculate the Hall coefficient and Hall voltage.
Pls help ASAP
Chapter 40 Solutions
Physics for Science and Engineering With Modern Physics, VI - Student Study Guide
Ch. 40.4 - Determine the three lowest rotational energy...Ch. 40.6 - Prob. 1BECh. 40.6 - Prob. 1CECh. 40.8 - Prob. 1DECh. 40 - What type of bond would you expect for (a) the N2...Ch. 40 - Describe how the molecule CaCl2 could be formed.Ch. 40 - Does the H2 molecule have a permanent dipole...Ch. 40 - Although the molecule H3 is not stable, the ion...Ch. 40 - The energy of a molecule can be divided into four...Ch. 40 - Would you expect the molecule H2+ to be stable? If...
Ch. 40 - Explain why the carbon atom (Z = 6) usually forms...Ch. 40 - Prob. 8QCh. 40 - Prob. 9QCh. 40 - Prob. 10QCh. 40 - Prob. 11QCh. 40 - Prob. 12QCh. 40 - Prob. 13QCh. 40 - Prob. 14QCh. 40 - Prob. 15QCh. 40 - Prob. 16QCh. 40 - Prob. 17QCh. 40 - Prob. 18QCh. 40 - Prob. 19QCh. 40 - Prob. 20QCh. 40 - Prob. 21QCh. 40 - Prob. 22QCh. 40 - Prob. 23QCh. 40 - Prob. 1PCh. 40 - (II) The measured binding energy of KCl is 4.43eV....Ch. 40 - (II) Estimate the binding energy of the H2...Ch. 40 - (II) The equilibrium distance r0 between two atoms...Ch. 40 - Prob. 5PCh. 40 - Prob. 6PCh. 40 - (III) (a) Apply reasoning similar to that in the...Ch. 40 - (I) Show that the quantity 2/I has units of...Ch. 40 - Prob. 9PCh. 40 - Prob. 10PCh. 40 - Prob. 11PCh. 40 - Prob. 12PCh. 40 - Prob. 13PCh. 40 - Prob. 14PCh. 40 - Prob. 15PCh. 40 - Prob. 16PCh. 40 - (II) Calculate the bond length for the NaCl...Ch. 40 - Prob. 18PCh. 40 - Prob. 19PCh. 40 - Prob. 20PCh. 40 - Prob. 21PCh. 40 - Prob. 22PCh. 40 - Prob. 23PCh. 40 - Prob. 24PCh. 40 - Prob. 25PCh. 40 - Prob. 26PCh. 40 - Prob. 27PCh. 40 - Prob. 28PCh. 40 - Prob. 29PCh. 40 - Prob. 30PCh. 40 - Prob. 31PCh. 40 - Prob. 32PCh. 40 - Prob. 33PCh. 40 - Prob. 34PCh. 40 - Prob. 35PCh. 40 - Prob. 36PCh. 40 - Prob. 37PCh. 40 - Prob. 38PCh. 40 - Prob. 39PCh. 40 - Prob. 40PCh. 40 - Prob. 41PCh. 40 - Prob. 42PCh. 40 - Prob. 43PCh. 40 - Prob. 44PCh. 40 - Prob. 45PCh. 40 - Prob. 46PCh. 40 - Prob. 47PCh. 40 - Prob. 48PCh. 40 - Prob. 49PCh. 40 - Prob. 50PCh. 40 - Prob. 51PCh. 40 - Prob. 52PCh. 40 - Prob. 53PCh. 40 - Prob. 54PCh. 40 - Prob. 55PCh. 40 - Prob. 56PCh. 40 - Prob. 57PCh. 40 - Prob. 58PCh. 40 - Prob. 59PCh. 40 - Prob. 60PCh. 40 - Prob. 61PCh. 40 - Prob. 62GPCh. 40 - Prob. 63GPCh. 40 - Prob. 64GPCh. 40 - Prob. 65GPCh. 40 - Prob. 66GPCh. 40 - Prob. 67GPCh. 40 - Prob. 68GPCh. 40 - Prob. 69GPCh. 40 - Prob. 70GPCh. 40 - Prob. 71GPCh. 40 - Prob. 72GPCh. 40 - Prob. 73GPCh. 40 - Prob. 74GPCh. 40 - Prob. 75GPCh. 40 - Prob. 76GPCh. 40 - Prob. 77GPCh. 40 - Prob. 78GPCh. 40 - Prob. 79GPCh. 40 - Prob. 80GPCh. 40 - Prob. 81GPCh. 40 - Prob. 82GPCh. 40 - Prob. 83GPCh. 40 - Prob. 84GPCh. 40 - Prob. 85GPCh. 40 - Prob. 86GPCh. 40 - Prob. 87GPCh. 40 - Prob. 88GPCh. 40 - Prob. 89GP
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- 2) For a KCl crystal (that you came across in Ch. 1) the unit cell parameter is 6.3Å and the Young's modulus of elasticity along (100] direction is 29.67 GPa (or 29.67 x10° N/m²). (a) Calculate the maximum value of the frequency of the optical branch and the corresponding wavelength. (b) Estimate the forbidden frequency band gap. The atomic masses of the K and Cl atoms are 39 amu and 37 amu, respectively (1 amu 1.67x10-27 kg) = (Hint: You may need to use the Young modulus of elasticity to find the spring constant).arrow_forwardThe maximum wavelength of light that a certain silicon photocell can detect is 1.11 mm. (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.arrow_forwardA tightly wound solenoid at 4.0 K is 50 cm long and is constructed from Nb wire of radius 1.5 mm. What maximum current can the solenoid carry if the wire is to remain superconducting?arrow_forward
- (a) Show that the resistivity of intrinsic germanium at 300 °K is 0.45 2.m if n₁ = 2.5×10¹⁹ m²³, n = 0.38 m²/V.s, p = 0.18 m²/v.s. -3 (b) If a donor-type impurity added to the extent of 1 atom per 108 germanium atoms, prove that the resistivity drops to 0.037 2.m. Density = 5.32x10³ Kg/m³, atomic weight 72.6.arrow_forwardThe probability of filling the band by• electrons 0.5 regardless to * temperature T, if E>Ef O Earrow_forwardThe angular frequency of vibrations in a one-dimensional monatomic crystal are given byω(k) = squareroot(4κ/m) l sin (ka/2) l,wherek = 2π/λis the wavenumber of the vibration pattern in terms of its wavelength λ, κ the spring constantbetween neighbouring atoms, and m the mass of each atom.(i) Show that the frequency does not change if one shiftsk → k + 2π/a(ii) Briefly explain the physical reason for this periodicityarrow_forward(3) The photon spectrum from the call molecule has a relatively strong line near λ = 8 milimeters. Estimate the bond length of the molecule by making reasonable assumption a Molar masses: M²₁ = 40₁1 g Mce= 35,5 g сеarrow_forwardFor inorganic LED emitting shorter wavelength (say blue) light, it typically also comes with narrower spectral width, and vice versa. Why is that? Gives your understanding.arrow_forward3arrow_forwardThe internal quantum efficiency is 0.65 for a 500μm long InP cavity laser having a reflectivity of 0.29 on both ends. Compute the slope quantum efficiency if the effective absorption coefficient is 10 cm-1 .arrow_forward(i) The total electrical resistivity of metals is the sum of the contributions from thermal vibrations, impurities and plastic deformation; (ii) the resistivity rises linearly with temperature above -200 degree Celsius; (iii) increasing the concentration of impurity results in an enhancement of impurity; (iv) plastic deformation also raises the electrical resistivity due to the increased numbers of electron-scattering dislocations. Which of the above statements is false? D. (iv) A. (i) C. (iii) E. All of the above B. (ii) Other:arrow_forward(c) Explain the phenomenon of stimulated emission in LASER.arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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