The three sources that brought young Earth to its melting point were
A) impact heating, convection heating, radiometric heating.
B) impact heating, gravitational contraction heating, radioactive decay heating.
C) impact heating, convection heating, radioactive decay heating.
D) collisional heating, contraction heating, radiometric heating.
Answer: B
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An optical fiber made of glass with an index of refraction 1.50 that is coated with a material with index of refraction 1.30 has a critical angle of
A) 90°. B) 41.8°. C) 60.0°. D) 50.2°. E) This combination will not work.
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What does the exclusion principle say?
A) No two particles of any type can ever occupy the same quantum state at the same time. B) If a particle has a precisely defined position it is excluded from having a precisely defined momentum. C) The laws of quantum mechanics are excluded from our common sense. D) Two fermions cannot occupy the same quantum state at the same time.
Briefly describe how a star forms
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