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Homework 2 (Chapter 2)

Homework 2 (Chapter 2) - Michael Yagudayev 106180606 CHE...

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Michael Yagudayev 106180606 CHE 131 Homework 2 R01 2. Millikan was able to determine the charge on an electron using his famous oil-drop experiment. Describe the experiment and explain how Millikan was able to calculate the mass of an electron using his results and the ratio discovered earlier by Thomson. By spraying tiny oil droplets into an apparatus surrounded by electrically charged plates, the oil droplets fell into the adjustable electric field. X-rays were used to inject electrons into the tiny oil droplets as they fell through the apparatus. Now being negatively charged, the droplets could be suspended in midair via the adjustable electric field. By measuring the electric field and taking the force of gravity to account, Millikan could find the charge of the oil droplets. The smallest charge was found to be approximately the elementary charge of 1.60 × 10 -19 C. 4. Ernest Rutherford’s famous gold-foil experiment examined the structure of atoms. (a) What surprising result was observed? The density of the atom is concentrated in the nucleus, located in the center of the atom. The protons and the neutrons exist in the nucleus, and the nucleus is much smaller than the rest of the atom.
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