The CNO cycle requires higher temperatures than those needed in the proton-proton fusion chain
a. True
b. False
Indicate whether the statement is true or false
True
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The light that comes from a ruby laser has a wavelength of 694.3 nm.
(a) What is the color of the laser light? (b) What is the energy of a photon from a ruby laser in air in joules and in electron volts?
The four general categories of "energy resources" from which we can obtain useful energy services are: fossil, nuclear, renewable [i.e., alternative], and
A) hydroelectric. B) breeder reactors. C) biomass. D) chemical. E) energy efficiency.
In Problem 2.7, the perpendicular distance d (in.) from force F to line AC is:
(A) 1.7 (B) 2.1 (C) 1.2 (D) 3.3
Where would you expect terrestrial planets to form in the solar nebula?
a. within the innermost regions (within about the inner 0.3 AU) b. anywhere between the innermost regions (within about the inner 0.3 AU) and the frost line c. anywhere outside the innermost regions (within about the inner 0.3 AU) d. anywhere outside the frost line