What would describe the earliest galaxies?
A) They were free of dark matter.
B) They were mostly elliptical galaxies.
C) They were mostly spiral galaxies.
D) They were undergoing rapid changes.
E) They were fully-formed,no longer evolving.
Ans: D) They were undergoing rapid changes.
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On a scale where the distance from Earth to the Sun is about 15 meters, the distance from Earth to the Moon is
A) small enough to fit within your hand. B) about 1 meter. C) about 5 meters. D) about 30 meters.
Refer to the sketch above of an H-R diagram for a star cluster. Which statement about this cluster is true?
A) It is probably located in the disk of the galaxy. B) It contains some stars that will soon undergo supernova explosions. C) It is probably located in a globular cluster. D) It is probably embedded in a molecular cloud in which new stars are being born.
A laser emits a pulse of light that lasts 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 480 mJ. How many photons are emitted in each pulse?
(c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.7 × 1018 B) 2.1 × C) 2.6 × D) 3.1 ×
Two mirrors are at right angles to one another. If an object is placed near the mirrors, what is the largest number of images that would be seen in the mirrors?
a. 3 b. 2 c. 4 d. 5 e. 6