Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
27
Early Quantum Theory and Models of the Atom
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27-1: Discovery of the Electron
27-2: Blackbodies; Planck's Quantum Hypothesis
27-3 and 27-4: Photons and the Photoelectric Effect
27-5: Compton Effect
27-6: Pair Production
27-8: Wave Nature of Matter
27-9: Electron Microscope
27-11 and 27-12: Spectra and the Bohr Model

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 3
Q

An oil drop whose mass is 2.8×1015 kg2.8 \times 10^{-15} \textrm{ kg} is held at rest between two large plates separated by 1.0 cm (Fig. 27–3), when the potential difference between the plates is 340 V. How many excess electrons does this drop have?

Millikan’s oil-drop experiment.
Figure 27-3 Millikan’s oil-drop experiment.
A
5 electrons
Giancoli 7th Edition, Chapter 27, Problem 3 solution video poster
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