Why can't a massive star generate energy through iron fusion?
What will be an ideal response?
Iron is the most tightly bound of all atomic nuclei. Nuclear fusion is able to release energy by combining less tightly bound nuclei into a more tightly bound nucleus, but once the gas in the core of the star has been converted to iron, there are no nuclear reactions that can combine iron nuclei and release energy. The iron core is a dead end in the evolution of a massive star.
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The method of dating the ages of rock and fossils using isotopic abundances is referred to as
A) radiometric dating B) speed dating C) dendrochronology D) radiochronology
Entropy: Which of the following is a false statement?
A. Entropy is a quantitative measure of disorder. B. The total entropy change in one cycle of a Carnot engine is zero. C. The entropy of an isolated system must be conserved (it remains constant). D. Entropy can be measured in units of J/K.
Light enters a substance from air at 30.0° to the normal. It continues within the substance at 23.0° to the normal. What is the critical angle for this substance when it is surrounded by air?
A) 53° B) 51.4° C) 36.7° D) 12.6°
Series/Parallel Circuits: Draw a circuit with two batteries, a resistor between them, and a capacitor in parallel with the resistor. The batteries are connected negative pole to positive pole.
A. 
B. 
C. 
D. 