J. J. Thomson is best known for his discoveries about the nature of cathode rays. His other important contribution was the invention, together with one of his students, of the mass spectrometer, a device that measures the ratio of mass m to (positive) charge q of an ion The spectrometer consists of two regions as shown in the figure (Eigure 1) In the first region an electric field accelerates the ion and in the second the ion follows a circular arc in a magnetic field. The radius of curvature of the arc can be measured and then the m/q ratio can be found. ▼ Part A After being accelerated to a speed of 1.86x105 m/s, the particle enters a uniform magnetic field of strength 0.700 T and travels in a circle of radius 32.0 cm (determined by observing where it hits the screen as shown in the figure). The results of this experiment allow one to find m/q Find the ratio m/q for this particle. Express your answer numerically in kilograms per coulomb. ▸ View Available Hint(s) m/q= Submit ——| ΑΣΦ Provide Feedback → SMK ? Review kg/C Next >

J. J. Thomson is best known for his discoveries about the nature of cathode rays. His other important contribution was the invention, together with one of his students, of the mass spectrometer, a device that measures the ratio of mass m to (positive) charge q of an ion The spectrometer consists of two regions as shown in the figure (Eigure 1) In the first region an electric field accelerates the ion and in the second the ion follows a circular arc in a magnetic field. The radius of curvature of the arc can be measured and then the m/q ratio can be found. ▼ Part A After being accelerated to a speed of 1.86x105 m/s, the particle enters a uniform magnetic field of strength 0.700 T and travels in a circle of radius 32.0 cm (determined by observing where it hits the screen as shown in the figure). The results of this experiment allow one to find m/q Find the ratio m/q for this particle. Express your answer numerically in kilograms per coulomb. ▸ View Available Hint(s) m/q= Submit ——| ΑΣΦ Provide Feedback → SMK ? Review kg/C Next >

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter28: The Atom

Section: Chapter Questions

Problem 63A

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Similar questions

An electron in a cathode ray tube is accelerated through a potential difference of 13550 V, then passes through the 2.37 cm wide region of uniform magnetic field in the diagram above. What magnetic field strength (in mT) will deflect the electron by 10°?
Assuming that the current is 1A and radius of the circular path of the electron is 4.9 What is the magnetic field where the electrons are traveling that results from this 1 A current in the Helmholtz coils? Hint: Evaluate the expression given for the field betwee two Helmholtz coils with the dimensions used in the experiment. Provide a numerical answer with no units, simply the field in "microtesla", that is in 10-6 T. For example, if you found 3.4 x 10-4 T, answer "340".
Given the following massspectrometer schematic, find theB-field such that the radius of theparticle’s trajectory is 0.194 m. Assume the particle is an electronwith mass 2.36 x 10-26 kg, and beginsits trajectory in an E-field of 2.1 x103 V/m.
What two pieces of evidence allowed the first calculation of me , the mass of the electron?(a) The ratios qe / me and q p / m p .(b) The values of qe and EB .(c) The ratio qe / me and qe .Justify your response.
An alpha particle is whizzing by at a velocity determined by its KE of 5 Mev. a ) What is the velocity of the alpha particle? b) What is the magnetic field at the position of a nucleus 2nm away from the alpha particle at angle of 900 to the velocity of the alpha. Alpha particle has charge of 2e but mass of 4 protons.
(a) Calculate the mass of a proton using the charge-to-mass ratio given for it in this chapter and its known charge. (b) How does your result compare with the proton mass given in this chapter?
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
A 2.50 MeV electron moves perpendicularly to a magnetic field in a path with a 3.0 cm radius of curvature.What is the magnetic field B?
In the Franck-Hertz experiment, explain why the small potential difference between the grid and collector plate is useful. Redraw the data of Figure the way the data would appear without this small retarding potential.
In a laboratory experiment designed to duplicate Thomson’s determination of qe / me , a beam of electrons having a velocity of 6.00×107 m/s enters a 5.00×10−3 T magnetic field. The beam moves perpendicular to the field ina path having a 6.80-cm radius of curvature. Determine qe / me from these observations, and compare the result with the known value.
What two pieces of evidence allowed the first calculation of me , the mass of the electron?(a) The ratios qe/me and qp /mp.(b) The values of qe and EB .(c) The ratio qe/me and qe .Justify your response.
What is the direction of a current that experiences themagnetic force shown in each of the three cases in Figure22.54, assuming the current runs perpendicular to B ?