The principle of Occam's Razor states that
A) scientific explanations may invoke supernatural causes if no other causes are found.
B) only a model that has survived repeated observational tests deserves to be called a scientific theory.
C) no scientific theory, no matter how well tested, can ever be proved absolutely true.
D) in explaining natural phenomena, the simplest explanation consistent with the observations is to be preferred.
E) while personal biases may influence individual scientists, the process of science itself can uncover these biases.
Question 2
The energy radiated by a typical quasar requires that its black hole accrete about
A) one solar mass a year.
B) ten solar masses a year.
C) one solar mass a day.
D) one solar mass a decade.
E) one solar mass a century.
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