Physics for Science and Engineering With Modern Physics, VI - Student Study Guide
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 38, Problem 55GP
To determine

The change in tunneling current through the tip of an STM.

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Suppose the velocity of an electron in an atom is known to an accuracy of 2.8 x 103 m/s. What is the electron's minimum uncertainty in position in nm? How many times larger is this compared with the approximate 0.1 nm size of the atom?
If an electron is to be diffracted significantly by a crystal, its wavelength must be about equal to the spacing, d, of crystalline planes. Assuming d = 0.350 nm, estimate the potential difference through which an electron must be accelerated from rest if it is to be diffracted by these planes
3. In a particular semiconductor device, an oxide layer forms a barrier 0.6 nm wide and 9V high between two conducting wires. An electron beam is accelerated through a 4V potential so that each electron approach the barrier with an energy of 4 eV. (a) What percent of the incident electrons will tunnel through the barrier? (b) Is aa for this system much larger than one, much less than one, or the same order of magnitude as one? Can we approximate the transmission coefficient using the formula below? - 16 (1-E) e E Vo T= 16; e-2aa (1) (c) Find the transmission coefficient using Eq. 1 and compare with your answer from part (a). Was Eq. 1 a good approximation?

Chapter 38 Solutions

Physics for Science and Engineering With Modern Physics, VI - Student Study Guide

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