Earth satellites are typically more than 100 km high so as to be above Earth's
A) atmosphere.
B) gravitational field.
C) both of these
Answer: A
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Radioactive Decay: A sample containing 4.0 × 1018 atoms of a radioactive isotope decays with a half-life of 2.3 years. How many undecayed atoms are left after 3.7 years?
A. 2.5 × 1018 B. 1.7 × 1018 C. 1.3 × 1018 D. 1.1 × 1018
A ________ happens when a white dwarf in a binary system accumulates more mass than the Chandrasekhar limit.
A. Type II supernova B. Pulsar C. Nova D. Type Ia supernova E. None of these choices is correct.
Nuclear Binding Energy: One of the fusion reactions that occurs in the sun is:
The following atomic masses are known:
What is the reaction energy released in this fusion reaction? (1 u = 931.5 MeV/c2)
A. 11 MeV B. 13 MeV C. 15 MeV D. 17 MeV E. 19 MeV
What is the source of the energy for the creation of heavy elements [heavier than iron]?
A) The shock of a supernova explosion. B) Fission. C) Helium fusion. D) Gravitational collapse. E) Hydrogen fusion.