Physics for Scientists and Engineers with Modern Physics
Physics for Scientists and Engineers with Modern Physics
4th Edition
ISBN: 9780131495081
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Chapter 38.9, Problem 1DE
To determine

The wavelength of the electron when it is inside the well.

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Scanning and tunneling electron microscopes are used to measure high resolution scientific images. As a general rule, the wavelength of the electrons must be at least as small as the item being scanned in order to detect/image the presence of the item. The new novel coronavirus has a size of 60 nm to 140 nm. The crowns or "corona" which are the protien like structures that extend from the body of the virus and have a length of 7 nm to 10 nm. The image above was taken at Rocky Mountain Laboratories in Montana, USA, using a tunneling electron microscope (TEM). What approximate size of wavelength was used to produce the image? 160 nm O 80 nm O 20 nm O 5 nm оооо
Barium has a work function of 2.48 eV. What is the maximum kinetic energy of electrons if the metal is illuminated by UV light of wavelength 375 nm? What is their speed?
Light with wavelength ? = 635 nm is incident on a metallic surface. Electrons are ejected from the surface. The maximum speed of these electrons is v = 4.40 ✕ 105 m/s. a) What is the work function of the metal (in eV)? b) What is the cutoff frequency for this metal (in Hz)?

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Physics for Scientists and Engineers with Modern Physics

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