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Giancoli's Physics: Principles with Applications, 7th Edition

Early Quantum Theory and Models of the Atom

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27-1: Discovery of the Electron

0:43

1:57

1:21

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

2:09

2:50

27-11 and 27-12: Spectra and the Bohr Model

Problem 3

An oil drop whose mass is $2.8 \times 10^{-15} \textrm{ kg}$ 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?

Figure 27-3 Millikan’s oil-drop experiment.

5 electrons

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An oil drop whose mass is 2.8×10−15 kg2.8 \times 10^{-15} \textrm{ kg}2.8×10−15 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?

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An oil drop whose mass is $2.8 \times 10^{-15} \textrm{ kg}$ 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?