COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 26, Problem 7QAP
To determine
The Compton Effect is practically unobservable for visible light. Why?
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-27
(c)
i. A thermal neutron has an energy of E= 0.025 eV and a mass of 1.675 x 107 kg.
Calculate the de Broglie wavelength of a thermal neutron.
ii. On the basis of this result, explain whether it is possible to observe diffraction
effects when the neutron is scattered by a cobalt crystal. Suggest a reason why
performing neutron diffraction experiments is challenging.
c) i) Calculate the energy loss of a photon when it is Compton-scattered through an angle
of 180°.
ii)
iii)
Calculate the energy loss of a photon when it undergoes two successive Compton
scatterings through an angle of 90° each.
Compare answers to (a) and (b).
• A beam of light with intensity of 3mW and a wavelength of 742 nm isstriking a solar cell. Estimate the number of photons incident on thecell.
Chapter 26 Solutions
COLLEGE PHYSICS
Ch. 26 - Prob. 1QAPCh. 26 - Prob. 2QAPCh. 26 - Prob. 3QAPCh. 26 - Prob. 4QAPCh. 26 - Prob. 5QAPCh. 26 - Prob. 6QAPCh. 26 - Prob. 7QAPCh. 26 - Prob. 8QAPCh. 26 - Prob. 9QAPCh. 26 - Prob. 10QAP
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- A light source of wavelength λ illuminates a metal and ejects photoelectrons with a maximum kinetic energyof 1.00 eV. A second light source with half the wavelength of the first ejects photoelectrons with a maximumkinetic energy of 4.00 eV.• Determine the work function of the metalarrow_forward7. Resolving ‘power’ of an electron microscope versus optical (photon) microscope: If a resolution of 1.0 x 10-11m (0.010nm) is required to ‘see’ an atom (a) If electrons are used (emicroscope), what minimum kinetic energy of the electrons is required? Use deBroglie’s Hypothesis and KE = p2 /2me and non-relativistic velocities: (b) If photons are used, what minimum KE (Eγ) is required to obtain 10-11m resolution?arrow_forwardHuman skin is relatively insensitive to visible light, but ultraviolet radiation can cause severe burns. Does this have anything to do with photon energies? Explain.arrow_forward
- Explain the significance of the Compton wavelength.arrow_forward3.23*) How many photons per second are emitted from a 100-W yellow lightbulb if we assume negligible thermal losses and a quasi- monochromatic wavelength of 550 nm? In actuality only about 2.5% of the total dissipated power emerges as visible radiation in an ordi- nary 100-W lamp. P= VI d.0 P-E 100arrow_forward3) A 2.0 mW green laser (A= 532 nm) shines on a cesium photocathode (b=1.95 eV). Assume an efficiency of 10-5 for producing photoelectrons (that is, one photoelectron produced for every 105 incident photons) and determine the photoelectric current. Answer 4) Calculate the maximum AA/1 of Compton scattering for blue light (A=480 nm, Ac=2.426 pm). Could this be easily observed? Answerarrow_forward
- Can an electron with a de Broglie wavelength of 2 μm pass through a slit that is 1 μm wide? Explain.arrow_forward2. When discussing Bragg scattering we showed that constructive interference between waves reflecting from Bragg planes occurs when Ar = 2d sin(0) = nλ where Ar was the path length difference, d was the spacing between Bragg planes, the angle between the incident motion (light ray or particle direction) and the Bragg plane, n an integer, and λ the wavelength of the light or deBroglie wave. When discussing the diffraction from a single crystal of Ni we expressed this condition for constructive interference as D sin(ø) = nλ, where D was the spacing between Ni atoms, and was the angle between particles shot perpendicular to a face of the Ni crystal and their reflection to a detector. The relation Φ between the angles is: 0 = and between the distances is d = D sin(). 2 (a) Using identity, e¹A cos(A) e¹A+e-iA 2 cos(A) + i sin(A), prove that sin(A) = where i = √-1 is an imaginary number. = = e¹A-e-iA 2i - (b) Using the identities from part (a) prove that sin(A - B) = sin(A) cos(B) – cos(A)…arrow_forward8) For the transfer function H(w) is shown below find the power spectral density and the average power of the following signals. i) | x(t) -2n -n/3 n /3 ii) x(t) -2То -То 0 То 2Tоarrow_forward
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