Which of the following places is not generally considered a potential home for life in our solar system?
A) Mars
B) Jupiter's atmosphere
C) Europa
D) Titan
B
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Which of the following is true of life on Earth?
A) Life, in the form of multicellular organisms, has existed on Earth for only about 2 million years. B) Life has existed on Earth for at least 3.4 billion years. C) The Cambrian explosion marks the formation of the first unicellular organisms on Earth. D) Complex multicellular organisms were present on Earth 2.5 billion years ago.
The peak of the quasar epoch was:
A) when there was still enough dark matter to fuel the supermassive black holes in their bar. B) when there was still sufficient mass to fuel the supermassive black holes at their center. C) before the formation of galaxies. D) before the star formation epoch. E) before mass had a chance to accumulate at the nucleus.
?Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity?
A. ?3 polarizing filters, each rotate beam by 30°. B. ?2 polarizing filters, both rotate beam by 45°. C. ?1 polarizing filter, rotating beam by 90°. D. ?None of the above, polarized light can't be rotated.
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