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30.2 Discovery of the Parts of the Atom: Electrons and Nuclei

Thomson's charge-to-mass measurement, Millikan's oil drop fixing the electron charge, and gold foil scattering revealing a tiny dense nucleus.

College Physics 2e, 30.2 Discovery of the Parts of the Atom: Electrons and Nuclei

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3 exercises

30.2 Exercise 1

In an experiment, three microscopic latex spheres are sprayed into a chamber and become charged with +3e, +5e, and −3e, respectively. Later, all three spheres collide simultaneously and then separate. Which of the following are possible values for the final charges on the spheres? Select two answers.

  1. +4e, −4e, +5e
  2. −4e, +4.5e, +4.5e
  3. +5e, −8e, +7e
  4. +6e, +6e, −7e
2.5

30.2 Exercise 5

Rutherford found the size of the nucleus to be about 10−15 m\text{10}^{- \text{15}} \text{ m}. This implied a huge density. What would this density be for gold?

2.5

30.2 Exercise 7

(a) An aspiring physicist wants to build a scale model of a hydrogen atom for her science fair project. If the atom is 1.00 m in diameter, how big should she try to make the nucleus?

(b) How easy will this be to do?

2.5

Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.