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.
The resolving power of a microscope depends on the wavelength used. If you wanted to "see" an atom, a
resolution of approximately 1.00 x 10-11 m would be required. If electrons are used (in an electron
microscope), what minimum kinetic energy is required for the electrons?
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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- 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?arrow_forwardFor 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_forwardscanning electron microscopy (SEM) exhibits higher resolution than transmission electron microscopy (TEM) 0 True O Falsearrow_forward
- Human skin is opaque to visible light but transparent to X-rays. Why?arrow_forwardProvide a detailed example of quantum entanglement along with images.arrow_forwardAn electron microscope is designed to resolve objects as small as 0.14 nm. What energy electrons must be used in this instrument?arrow_forward
- The 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_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_forwardWhat is the difference between SEM and TEM electron microscopes?arrow_forward
- The most important properties of x-raysarrow_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_forwardWhy can you see through glass but not through wood?arrow_forward
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