Which one of the following is TRUE?
A. Irregular galaxies rarely have star formation taking place in them.
B. Most galaxies appear to be approaching the Milky Way Galaxy.
C. Most elliptical galaxies contain only young stars.
D. Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way.
E. Galaxy collisions destroy most of the stars in the galaxies involved.
Ans: D. Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way.
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The SI unit H (the henry) is equal to a
A. V/m. B. V/A. C. V·s. D. V·s/A. E. V·A/s.
If you compare two stars,
a. the one with the larger radius will always have the greater luminosity. b. the one with the higher surface temperature will always have the greater luminosity. c. the one with the smaller absolute magnitude will always have the greater luminosity. d. the one with the larger surface area has the greater energy flux from its surface.
Which describes our understanding of flowing water on Mars?
a. It was never important. b. It was important once, but no longer. c. It is a major process on the Martian surface today.
The distance between the object and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm
The near-point distance of the person using the microscope is 25.0 cm. What is the total magnification of the microscope? A) -120 B) -184 C) -200 D) -360 E) -480