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Chapter 1: Problem 3
Two converging lenses are in contact. If the focal lengths are each \(5 \mathrm{~cm}\), what is the equivalent focal length of the combination? 1\. \(0.1 \mathrm{~cm}\) 2\. \(2.5 \mathrm{~cm}\) 3\. \(5.0 \mathrm{~cm}\) 4\. \(10.0 \mathrm{~cm}\)
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A negatively charged droplet has a mass of \(5 \times 10^{-16} \mathrm{~kg}\) and carries a charge of \(8 \times 10^{-18} \mathrm{C}\). The droplet falls through the hole in the upper plate when the electric field is \(0 \mathrm{~V} / \mathrm{m}\). How does the drop move within the plates as the electric field is increased slowly from \(0 \mathrm{~V} / \mathrm{m}\) to \(800 \mathrm{~V} / \mathrm{m}\) ? (Note: Assume that the drop remains between the plates at all times.) 1\. It moves downwards, stops, then moves upwards. 2\. It moves downwards, accelerating all the time. 3\. It moves downwards, stops, then moves downwards again. 4\. It moves downwards, stops, and remains stationary.
In many warm climates, locusts feed on agricultural crops and lizards feed on locusts. Which of the following is most analogous to the effect that eradicating the tsetse fly would have on African grasslands? 1\. Locusts transmit a deadly parasite from the agricultural crops to the lizards. 2\. Lizards are dependent upon both the locusts and the grasslands for nourishment. 3\. Elimination of the locusts results in bumper wheat crops. 4\. Elimination of lizards results in locust infestation and devastation of agricultural crops.
What type of intermolecular force(s) can exist between two neon atoms? 1\. Dispersion forces 2\. Dipole-induced dipole 3\. \(\quad\) Dipole-dipole 1\. I only 2\. II only 3\. I and II only 4\. I and III only
If a cluster can be broken up by a photon with a wave number of \(1000 \mathrm{~cm}^{-1}\), what is the cluster's energy? (Note: Planck's constant \(=6.6 \times 10^{-34} \mathrm{~J} \cdot \mathrm{s}\).) 1\. \(6.6 \times 10^{-31} \mathrm{~J}\) 2\. \(6.6 \times 10^{-29} \mathrm{~J}\) 3\. \(2.0 \times 10^{-26} \mathrm{~J}\) 4\. \(2.0 \times 10^{-20} \mathrm{~J}\)
In which atomic orbital(s) to the alkaline earth elements contain valence electrons? 1\. \(s\) 2\. \(d\) 3\. \(s\) and \(d\) 4\. \(\quad s, d\), and \(p\)
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