College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 27, Problem 2CQ
To determine
Why is an electron microscope more suitable than an optical microscope for seeing the objects of atomic size.
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The smallest resolving power of a microscope is proportional to the magnitude of the wavelength used.
a) 15 nm and
b) How many energetic electrons are needed in the electron microscope for a resolution of 0.5nm?
An electron microscope uses magnets to accelerate electrons with negligible initial speed through apotential difference of 50 million volts. Calculate the ratio of the resolution of this electron microscope to theresolution of a microscope that uses visible light with a wavelength of 5.00 × 10−7 m through a circularaperture with an aperture of 5.00 mm.
7. 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?
Chapter 27 Solutions
College Physics
Ch. 27.5 - Prob. 27.1QQCh. 27.5 - Prob. 27.2QQCh. 27.5 - Prob. 27.3QQCh. 27.6 - Prob. 27.4QQCh. 27.6 - Prob. 27.5QQCh. 27 - Prob. 1CQCh. 27 - Prob. 2CQCh. 27 - Prob. 3CQCh. 27 - Prob. 4CQCh. 27 - Prob. 5CQ
Ch. 27 - Prob. 6CQCh. 27 - Prob. 7CQCh. 27 - Prob. 8CQCh. 27 - Prob. 9CQCh. 27 - Prob. 10CQCh. 27 - Prob. 11CQCh. 27 - Prob. 12CQCh. 27 - Prob. 13CQCh. 27 - Prob. 14CQCh. 27 - Prob. 15CQCh. 27 - Prob. 16CQCh. 27 - Prob. 1PCh. 27 - Prob. 2PCh. 27 - Prob. 3PCh. 27 - Prob. 4PCh. 27 - Prob. 5PCh. 27 - Prob. 6PCh. 27 - Prob. 7PCh. 27 - Prob. 8PCh. 27 - Prob. 9PCh. 27 - Prob. 10PCh. 27 - Prob. 11PCh. 27 - Prob. 12PCh. 27 - Prob. 13PCh. 27 - Prob. 14PCh. 27 - Prob. 15PCh. 27 - Prob. 16PCh. 27 - Prob. 17PCh. 27 - Prob. 18PCh. 27 - Prob. 19PCh. 27 - Prob. 20PCh. 27 - Prob. 21PCh. 27 - Prob. 22PCh. 27 - Prob. 23PCh. 27 - Prob. 24PCh. 27 - Prob. 25PCh. 27 - Prob. 26PCh. 27 - Prob. 27PCh. 27 - Prob. 28PCh. 27 - Prob. 29PCh. 27 - Prob. 30PCh. 27 - Prob. 31PCh. 27 - Prob. 32PCh. 27 - Prob. 33PCh. 27 - Prob. 34PCh. 27 - Prob. 35PCh. 27 - Prob. 36PCh. 27 - Prob. 37PCh. 27 - Prob. 38PCh. 27 - Prob. 39PCh. 27 - Prob. 40PCh. 27 - Prob. 41APCh. 27 - Prob. 42APCh. 27 - Prob. 43APCh. 27 - Prob. 44APCh. 27 - Prob. 45APCh. 27 - Prob. 46APCh. 27 - Prob. 47APCh. 27 - Prob. 48APCh. 27 - Prob. 49APCh. 27 - Prob. 50APCh. 27 - Prob. 51APCh. 27 - Prob. 52AP
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- For a given accelerating voltage, an electron microscope has a certain theoretical resolution. Suppose that instead of a beam of electrons you used a beam of protons, with the same accelerating voltage. How would this affect the theoretical resolution?arrow_forwardProvide a detailed example of quantum entanglement along with images.arrow_forwardThe spacing between atomic planes in a crystal is 0.130 nm. a) If 15.0 keV x rays are diffracted by this crystal, what is the angle of first-order diffraction? b) If 15.0 keV x rays are diffracted by this crystal, what is the angle of second-order diffraction?arrow_forward
- 2. Explain whether the following statements are true or false. (a) When the primary electron beam in the SEM is defocussed to get an electron beam of higher intensity and larger spot size to improve secondary electron signal generated from the specimen, the spatial resolution of the secondary electron image will also be higher.arrow_forwardA diffracted x-ray beam is observed from the (220) planes of cobalt at a 2? angle of 99.2° when x-rays of 0.1790260 nm wavelength are used. Calculate the lattice parameter of the cobalt (in nm). ___________nmarrow_forwardThe spacing between crystalline planes in the NaC1 crystal is 0.281 nm, as determined by X-ray diffraction with X-rays of wavelength 0.170 nm. What is the energy of neutrons in the neutron beam that produces diffraction peaks at the same locations as the peaks obtained with the X-rays?arrow_forward
- Why can you see through glass but not through wood?arrow_forwardWhy are X-rays emitted only for electron transitions to inner shells? What type of photon is emitted for transitions between outer shells?arrow_forwardSpeculate as to how the diffraction patterns of a typical crystal would be affected if -rays were used instead of X-rays.arrow_forward
- Check Your Understanding Suppose that the diameter of the aperture in Example 6.16 is halved. How does it affect the resolving power?arrow_forwardAt what velocity will an electron have a wavelength of 1.00 m?arrow_forwardHow is a Blu-Ray player able to read more information that a CD player?arrow_forward
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