What allows a high-mass star to fuse different elements from a low-mass star?
A. Its greater mass means that it contains more elements.
B. More mass means a stronger magnetic field that helps heavier elements fuse.
C. High-mass stars spin slower and thus do not mix their fuels as well.
D. More mass means more compression and thus a hotter core that allows heavier elements to fuse.
E. The statement is false. Low-mass and high-mass stars can fuse the same elements.
Answer: D
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a. 0.6 b. 6 c. 60 d. 600 e. 6000
Two identical concentric loops are arranged as shown in the diagram below. Loop 1 initially carries a steady current driven by the power supply shown, will the two loops briefly attract or repel each other as the current in loop 1 decays to zero? 
Suppose that when we turn off the power supply, it takes a small but finite time for the current to decay to zero in loop 1. In what direction does the current induced in loop 2 flow during this time interval?
A. They attract each other. B. They repel each other. C. They neither attract nor repel each other. D. One needs more information to answer.
When an electron in a hydrogen atom drops from the second to the first excited energy state it emits a bright red emission line called hydrogen alpha
Indicate whether the statement is true or false
What is the radius of the smallest Bohr orbit?
A) 2.14 × 10-9 m B) 1.12 × 10-9 m C) 1.56 × 10-11 m D) 3.17 × 10-11 m E) 5.29 × 10-11 m