In the above diagram, which atom behaves as the oxidizing agent, the lighter colored atom or the darker colored atom?
A) Both atoms behave as the oxidizing agent.
B) Neither of the atoms behave as the oxidizing agent.
C) The darker colored atom behaves as the oxidizing agent.
D) The lighter colored atom behaves as the oxidizing agent.
Answer: D
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Suppose you read somewhere that 10 percent of the matter in the Milky Way is in the form of dust grains. Should you be surprised? If so, why?
A) Given how easily dust grains can form, 10 percent is a surprisingly low fraction. B) The fraction of 10 percent is surprisingly high because dust grains can form only at low temperatures. C) There is nothing surprising about the 10 percent figure because dust grains are the material from which stars are born. D) The fraction of 10 percent cannot be correct. Dust grains are solid and only 2 percent of the matter in the galaxy is made of anything besides hydrogen and helium.
An electron and a positron (antielectron), both nearly at rest, collide. What particle(s) is(are) produced?
a. One photon of energy 1.02 MeV b. Two photons of energy 511 keV c. A pi-meson d. A K-meson and an anti-neutrino
The photo on page 193 shows Lillian's hair standing out when her hand is on a charged Van de Graaff generator, which illustrates
A) strands of hair become charged and repel one another. B) a high voltage is communicated to strands of hair. C) strands of hair orient themselves in an electric field. D) the effect of electrons and protons deposited on her hair.
Suppose the star Sirius were moved to a distance 7 times closer to Earth than it is now. How would its apparent brightness change?
A) It would be 7 times as bright. B) It would be 1/7 as bright. C) It would be 1/49 as bright. D) It would be 49 times as bright.