The speed of sound varies with
A) loudness.
B) frequency.
C) wavelength.
D) all of the above
E) none of the above
Answer: E
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If you had something the size of a sugar cube that was made of white dwarf matter, it would weigh ________
A) as much as a truck B) as much as an average person C) about 5 pounds D) as much as the entire Earth
If the stable nuclei are plotted with neutron number vs. proton number, the curve formed by the stable nuclei does not follow the line N = Z. This is predicted by examining how the binding energy is influenced by
a. the volume of the nucleus. b. the size of the nuclear surface. c. the Coulomb repulsion. d. the proton-neutron mass difference.
Why are white dwarf supernovae more useful than massive star supernovae for measuring cosmic distances?
A) White dwarf supernovae all have roughly the same true peak luminosity, while massive supernovae come in a wide range of peak luminosities. B) We can see only white dwarf supernovae in distant galaxies, not massive star supernovae. C) White dwarf supernovae are much more common than massive star supernovae. D) White dwarf supernovae obey Leavitt's law, while massive supernovae do not.
Process of Science: Evidence for dark matter in galaxy clusters can be seen in observations of the motions of individual galaxies, X-ray observations of hot intra-cluster gas, and gravitational lensing
What is different about lensing that further strengthens the case that dark matter really does exist.