About how many stars can be seen from somewhere on Earth with the naked eye?
A) 600
B) 6,000
C) 600,000
D) 6,000,000
E) Uncountably many
B
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The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal. B) always are in the red part of the visible spectrum. C) have wavelengths that are shorter than normal. D) have a higher intensity in the red part of the spectrum.
In what range of masses are most stars found? What about the range in luminosity? How are they related?
What will be an ideal response?
An ideal gas is at a pressure 1.00 × 105 N/m2 and occupies a volume 2.00 m3. If the gas is compressed to a volume 1.00 m3 while the temperature remains constant, what will be the new pressure in the gas?
A) 0.500 × 105 N/m2 B) 4.00 × 105 N/m2 C) 1.00 × 105 N/m2 D) 2.00 × 105 N/m2 E) The answer depends on the mass of the gas particles.
An image formed using a converging lens
a. is always real. b. is always virtual. c. can have negative magnification. d. can never be upright.