The name of which astronomer is most closely linked with that of Ejnar Hertzsprung?
a. Johannes Kepler
b. Henrietta Leavitt
c. Henry Russell
d. Edwin Hubble
c
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A neutron star is created when a(n) ___
a. collapsing stellar core exceeds the Schwarzschild limit b. collapsing stellar core exceeds the Hawking limit c. stellar core exceeds the Roche limit d. collapsing stellar core exceeds the Chandrasekhar limit e. stellar core ignites iron fusion
Which nuclear fusion processes occur in Sun-like stars?
a. triple alpha b. CNO and triple alpha c. proton-proton and triple alpha d. All of the other choices are correct.
An emission spectrum can be used to identify a(n):
A) proton. B) electron. C) neutron. D) atom. E) neutrino.
A charge of 0.80 nC is placed at the center of a cube that measures 4.0 m along each edge. What is the electric flux through one face of the cube?
A. 90 N ? m2/C B. 15 N ? m2/C C. 45 N ? m2/C D. 23 N ? m2/C E. 64 N ? m2/C