Which of the following statements best summarizes current evidence concerning dark matter in individual galaxies and in clusters of galaxies?
A) Within individual galaxies, dark matter is always concentrated near the galactic center, and within clusters it is always concentrated near the cluster center.
B) Dark matter is present in individual galaxies, but there is no evidence that it can exist between the galaxies in a cluster.
C) Dark matter is present between galaxies in clusters, but not within individual galaxies.
D) Dark matter is the dominant form of mass in both clusters and in individual galaxies.
D
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Faraday's Law: The magnetic flux through a coil changes steadily from 4.0 × 10-5 T ? m2 to 5.0 × 10-5 T ? m2 in 0.10 s. What emf is induced in this coil?
A. 5.0 × 10-4 V B. 4.0 × 10-4 V C. 1.0 × 10-4 V D. None of the given answers are correct.
The spectra of different elements can be distinguished because
a. they have the same spectral lines, but the lines are of different intensities b. they have spectral lines in different positions c. every element has one unique spectral line d. none of the above
Which of these has the greatest number of protons in its nucleus?
A) gold B) mercury C) lead D) silver
What normally occurs in a saucer of water placed on your table is
A) evaporation. B) condensation. C) both of these D) none of the above