Rutherford's experiment, in which he fired alpha particles of 7.7 MeV kinetic energy at a thin gold foil, showed that nuclei were very much smaller than the size of an atom because
a. some alpha particles passed through the foil undeflected. b. some alpha particles were deflected backwards.
c. some alpha particles were captured by the gold nuclei.
d. the alpha particles could not get closer than 10-10 m to the gold nuclei.
e. the alpha particles split into deuterium nuclei when they encountered the gold nuclei.
B
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Which is the correct description of the Sun's location within the Milky Way?
A) in the disc but at its outer edge B) as Herschel found, very close to the Galactic center C) in the disc and about one-half a galactic radius from the center D) above the disc and about one-third of the galactic radius from the center E) at the outer edge of the galactic bulge but in the plane of the disc
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A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery has some internal resistance. The switch S, originally open, is closed. What happens to the total power delivered to the lamps by the battery?
In a photo like the Hubble eXtreme Deep Field (Figure 20.1 in your text), we see galaxies in many different stages of their lives. In general, which galaxies are seen in the earliest (youngest) stages of their lives?
A) the galaxies that are farthest away B) the galaxies that have the most hot, young stars of spectral types O and B C) the galaxies that are the reddest in color D) the galaxies that are nearest to us