A(n) ___________ is a set of beliefs that appears to be based on scientific ideas, but which fails to obey the most basic rules of science
a. theory
b. hypothesis
c. pseudoscience
d. allegory
e. scientific model
C
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Time Dilation: Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year). Relative to a frame of reference that is fixed with respect to Earth, how long does it take Rob to complete the trip?
A. 14.4 years B. 15.0 years C. 10.8 years D. 4.20 years E. 22.7 years
Why don't low-mass stars have the CNO cycle occurring in their cores?
A) The CNO cycle makes elements heavier than carbon, nitrogen, and oxygen. B) They don't have enough carbon, nitrogen, and oxygen. C) Their core temperatures are too low.
Suppose that, through the malicious act of an eight-dimensional alien being, the strong force was suddenly turned off throughout the universe. What would happen almost immediately to atoms?
A) Electrons would fall into the nuclei of atoms. B) Atoms would be immediately ionized. C) The nuclei of atoms would fall apart. D) Gravity would become the strongest force in nature. E) nothing
The energy level diagram for hydrogen
The energy of the most energetically possible photon emitted is __________.