If a star with an absolute magnitude of ?5 has an apparent magnitude of +5, then its distance is
a. 1 pc.
b. 10 pc.
c. 100 pc.
d. 1000 pc.
e. 10,000 pc.
d
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Coronae on Venus are believed to be
a. impact craters. b. caused by rising convection currents in the interior of Venus. c. the result of plate tectonics. d. located only in the polar regions of Venus. e. much older than the highlands such as Ishtar Terra.
Which object has the most intense sunlight on it?
a. Mercury b. Venus c. Earth d. Mars
If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because ________
A) the impact caused massive earthquakes worldwide B) radiation from iridium in the asteroid caused the dinosaurs to die of cancer C) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact D) of injuries suffered from direct hits of pieces of the asteroid or comet
In the four radioactive series, the nuclei decay by either emitting alpha particles or beta particles until they reach the stable end product. Each decay, therefore, results in a mass number change of either 4 (for alpha decay) or 0 (for beta decay). The radium isotope 226Ra is in one of these series. What is the starting isotope in the series containing 226Ra?
a. 238U b. 235U c. 232Th d. 237Np