What is the most abundant element in the interstellar medium?
a. carbon
b. iron dust
c. carbon dust
d. helium
e. hydrogen
e
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Approximately what core temperature is required before hydrogen fusion can begin in a star?
A) 10,000 K B) 10 million K C) 1 billion K D) 10 billion K E) 10 trillion K
The energy of a proton is 1.0 MeV below the top of a 6.8-fm-wide energy barrier
What is the probability that the proton will tunnel through the barrier? (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 0.051 B) 0.048 C) 0.056 D) 0.053
If you connect two identical storage batteries together in parallel, and place them in a circuit, the combination will provide
A) twice the voltage and twice the total charge that one battery would. B) twice the voltage and the same total charge that one battery would. C) the same voltage and twice the total charge that one battery would. D) half the voltage and half the total charge that one battery would. E) half the voltage and twice the total charge that one battery would.
Carnot Engine: An ideal Carnot engine operates between a warm reservoir at 233 K and a colder reservoir. During each cycle, this engine extracts 15.0 J of heat from the warm reservoir and does 4.0 J of work. What is the temperature of the colder reservoir?
A. 171 K B. 62 K C. 47 K D. 67 K