When uranium-238 (Z = 92) is bombarded with a neutron, it can change into
a. uranium-237
b. uranium-239
c. protactinium-239 (Z = 91)
d. neptunium-239 (Z = 93)
e. none of the above
B
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If an extrasolar planet suddenly became more massive, but kept the same radius and orbit, what would change during an observed transit?
A) The amount of starlight would have a larger dip during the transit. B) The amount of starlight would have a smaller dip during the transit. C) The time between transits would decrease. D) The time between transits would increase. E) Nothing. The mass of a planet does not affect the appearance of a transit.
Which of the following methods has been the LEAST successful in detecting extrasolar planets around other star systems?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of Doppler shifts in the spectra of the parent stars C) detection of brightness changes in a star as a planet passes in front of it D) detection of reflected starlight
A rain shadow is associated with
A) the leeward slope of a mountain. B) orographic lifting. C) descending dry air. D) descending dry air on the leeward slope of a mountain.
Galileo's telescopic discoveries of mountains on the moon and spots on the sun were controversial because they suggested that the sun and moon
a. were the same kind of object. b. were not perfect spheres. c. were inhabited. d. orbited each other. e. did not orbit Earth.