Which kind of star is highly unlikely to be found in the halo of the Milky Way?
A) O star B) G star C) K star D) M star
A
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If one's hands are being warmed by holding them to one side of a flame, the predominant form of heat transfer is what process?
a. conduction c. convection b. radiation d. vaporization
According to Einstein, increasing the brightness of a beam of light without changing its color will increase:
a. the frequency of the photons. c. the speed of the photons. b. the energy of each photon. d. the number of photons.
An air-filled 20-?F capacitor has a charge of 60 ?C on its plates. How much energy is stored in this capacitor?
A) 70 ?J B) 80 ?J C) 90 ?J D) 100 ?J E) 110 ?J
How do we determine the age of an oil deposit?
a. By measuring the amount of uranium that has not decayed into lead. b. By measuring its ratio of carbon-14 to carbon-12. c. By exposing the sample to cosmic rays in the environment to produce carbon-14. d. By calculating the amount of lead that has decayed from uranium. e. By calculating the amount of carbon that has decayed into nitrogen.