The proton-proton chain
a. combines two hydrogen nuclei to produce a single helium nucleus and energy.
b. splits a helium nucleus to produce 4 hydrogen nuclei and energy.
c. is the mechanism that increases the temperature between the photosphere and corona of the sun.
d. is the interactions between protons in Earth's atmosphere that produces auroras.
e. produces energy in the core of the sun in the form of gamma-rays, positrons, and neutrinos.
E
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Which of the following molecules would probably be isolated closest to the top of a fractionating tower at a refinery?
A) C4H10 B) C8H18 C) C10H22 D) C20H42 E) C40H82
The following three appliances are connected to a 120-V house circuit: i) toaster, 1 325 W, ii) coffee pot, 650 W, and iii) microwave, 600 W. If all were operated at the same time, what total current would they draw?
a. 2.10 A b. 47.5 A c. 7.15 A d. 21.5 A e. 11.0 A
Energy added to a cyclical heat engine
A. is used to generate work that is greater than the added energy. B. is converted to work and to waste heat. C. is converted to increased internal energy in the engine plus external work. D. is completely converted to external work.
A grating is made with 600 slits per millimeter. What is the slit separation?
A. 600 nm
B. 
C. 
D. 160 pm
E. 916 nm