What prevents a brown dwarf from undergoing nuclear fusion?
A) Degeneracy pressure halts the contraction of a protostar so the core never becomes hot or dense enough for nuclear fusion.
B) There is not enough mass to maintain nuclear reactions in a self-sustaining way.
C) The surface temperature never rises high enough for the radiation to be trapped and heat its interior to the temperature required for nuclear fusion.
D) Radiation pressure halts the contraction of a protostar so the core never becomes hot or dense enough for nuclear fusion.
E) There are too many heavy elements and not enough hydrogen for fusion to occur in a self sustaining way.
A) Degeneracy pressure halts the contraction of a protostar so the core never becomes hot or dense enough for nuclear fusion.
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Which of the following scenarios involves energy that we would typically calculate with Einstein's formula E = mc2?
A) A small amount of the hydrogen in a nuclear bomb becomes energy as fusion converts the hydrogen to helium. B) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy. C) A mass raised to a great height has a lot of gravitational potential energy. D) An object accelerated to a great speed has a lot of kinetic energy.
The sun's energy comes from
A) the fission of uranium. B) the fusion of helium into hydrogen. C) the fission of helium into hydrogen. D) the fusion of hydrogen into helium. E) None of the above.
A Young's interference experiment is conducted with blue-green argon laser light (l = 515 nm). The separation between the slits is 0.50 mm, and the interference pattern appears on a screen 4.95 m away. What is the spacing between the bright fringes? (1 nm = 10-9 m)
a. 3.4 mm c. 1.7 mm b. 5.1 mm d. 6.8 mm
Process of Science: Explain how technology advances help address astronomical questions
What will be an ideal response?