Modern Physics for Scientists and Engineers
Modern Physics for Scientists and Engineers
4th Edition
ISBN: 9781133103721
Author: Stephen T. Thornton, Andrew Rex
Publisher: Cengage Learning
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Chapter 4, Problem 7Q
To determine

Using Hg gas in the Franck-Hertz experiment, approximately what range of voltages are expected for the first peak.

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Find the kinetic energy (in eV) of an electron whose deBroglie wavelength is equal to 0.5 Å = 0.05 nm, a typical atomicsize. (b) If the wavelength of the electron is reduced to 10–15 m, atypical nuclear size, is its kinetic energy greater than, less than, orequal to the value found in part (a)? Explain
What is the rms speed (Urms) of an He atom at 28C? Solve and explain.
Assuming that the radius of the circular path of the electron is 4.9cm when voltage is 100v and coil current is 1A and The Helmholtz coils have 130 turns and a radius of 15 cm. With N=130 and R=0.15   What is the velocity of the electrons at 100 V, assuming the known charge and mass of the electron from the accepted universal constants that are the basis of SI units? Hints:  Do a classical calculation of the kinetic of the electon assuming you know its mass (in kg) and its charge (in coulomb).  That will be 1/2 mv2.  Equate that to the energy of the electron gained by accelerating in the electric field, that is, eV where "e" is the charge and "V" is the difference potential in volts. Solve for "v", the velocity. Enter your answer in km/s, 103 m/s, without units.  It is best to enter only a number, without an "e".  For example, if you found 2000 m/s you would enter "2" for the velocity in km/s.  Electrons have low mass and achieve high velocity in modest fields.
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