Modern Physics for Scientists and Engineers
4th Edition
ISBN: 9781133103721
Author: Stephen T. Thornton, Andrew Rex
Publisher: Cengage Learning
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Question
Chapter 3, Problem 4P
(a)
To determine
The electric field required to produce zero deflection in the electron.
(b)
To determine
The vertical distance covered by the electron under the electric field if magnetic field is switched off.
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a) Suppose we have an electron moving perpendicular to a B-field along a circular path of radius 18 cm. If imposition of an E-field of 17.1 kV/m makes the path straight, what is the value of B?
b) Suppose our E-field measurement has an uncertainty of 0.75 kV/m and our radius of curvature measurement has an uncertainty of 0.2 cm. What is the total uncertainty associated with the magnetic field we just calculated?
The deflector plates of a Thomson appliance are 6.0 cm long and separated by 1.2 cm. The distance between the front edge of the plate and the tube is 30.0 cm. The energy assigned to the electrons of the beam is 2.8 keV (can make an illustration for a good understanding)
(a) If the potential of 25 V is applied to the deflector plates, what will be the deviation of the beam on the screen?
(b) Find the module of the crossed magnetic field that would allow the beam to pass through the plates, without suffering any deviation.
Answer a) 7.36 mm b) 6.64 x 10^ - 5 T
In Thomson's experimental setup (Figure given below), the length of the deflecting
plate is 3.0 cm and the distance of the screen to the deflecting plate is 1.0m (x axis). With
the applied electrical field of 2.1 x10° V/m, image of the electron beam is observed at the
height of 36 cm (y axis). With the applied magnetic field of 1.2 x 10° T, the image is seen at
the center of the screen with no deflection.
a) Find the initial velocity of the electron.
b) Find the q/m for the electron.
c) If the length of the deflecting plate would be 2.5 cm, where would the beam is observed?
d) Assuming mass of the electron is known and the value is m=9.1x1031 kg, find the rest
Energy, total energy and the kinetic energy of the electron.
e) Find the relativistic momentum of the electron.
Hint: Use equations in Thomson's experiment for a, b and c. Use relativistic kinematic
equations for d and e by using the velocity you obtained in a.
Deflecting plates-
Cathode
AB
Anode
Fluorescent screen-
High voltage…
Chapter 3 Solutions
Modern Physics for Scientists and Engineers
Ch. 3 - Prob. 1QCh. 3 - Prob. 2QCh. 3 - Prob. 3QCh. 3 - Prob. 4QCh. 3 - Prob. 5QCh. 3 - Prob. 6QCh. 3 - Prob. 7QCh. 3 - Prob. 8QCh. 3 - Prob. 9QCh. 3 - In the experiment of Example 3.2, how could you...
Ch. 3 - Prob. 11QCh. 3 - Prob. 12QCh. 3 - Prob. 13QCh. 3 - Prob. 14QCh. 3 - Prob. 15QCh. 3 - Prob. 16QCh. 3 - Prob. 17QCh. 3 - Prob. 18QCh. 3 - Prob. 19QCh. 3 - Prob. 20QCh. 3 - Prob. 21QCh. 3 - Prob. 22QCh. 3 - Prob. 23QCh. 3 - Prob. 24QCh. 3 - Prob. 25QCh. 3 - Prob. 26QCh. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Across what potential difference does an electron...Ch. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8PCh. 3 - Prob. 9PCh. 3 - Prob. 10PCh. 3 - Prob. 11PCh. 3 - Prob. 12PCh. 3 - Prob. 13PCh. 3 - Prob. 14PCh. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - Calculate max for blackbody radiation for (a)...Ch. 3 - Prob. 18PCh. 3 - Prob. 19PCh. 3 - Prob. 20PCh. 3 - White dwarf stars have been observed with a...Ch. 3 - Prob. 22PCh. 3 - Prob. 23PCh. 3 - Prob. 24PCh. 3 - Prob. 25PCh. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 32PCh. 3 - Prob. 33PCh. 3 - Prob. 34PCh. 3 - Prob. 35PCh. 3 - Prob. 36PCh. 3 - Prob. 37PCh. 3 - Prob. 38PCh. 3 - Prob. 39PCh. 3 - Prob. 40PCh. 3 - Prob. 41PCh. 3 - Prob. 42PCh. 3 - Prob. 43PCh. 3 - Prob. 44PCh. 3 - Prob. 45PCh. 3 - Prob. 46PCh. 3 - Prob. 47PCh. 3 - Prob. 48PCh. 3 - Prob. 49PCh. 3 - Prob. 50PCh. 3 - Prob. 52PCh. 3 - Prob. 53PCh. 3 - Prob. 54PCh. 3 - Prob. 55PCh. 3 - Prob. 56PCh. 3 - Prob. 57PCh. 3 - Prob. 58PCh. 3 - Prob. 59PCh. 3 - Prob. 60PCh. 3 - Prob. 61PCh. 3 - Prob. 62PCh. 3 - Prob. 63PCh. 3 - Prob. 64PCh. 3 - Prob. 65PCh. 3 - Prob. 66PCh. 3 - Prob. 67PCh. 3 - Prob. 68PCh. 3 - The Fermi Gamma-ray Space Telescope, launched in...Ch. 3 - Prob. 70P
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