What is a disadvantage of using a single large lens in a telescope?
A. Different colors of white light on passing through a lens focus at different points and result in a blurred image.
B. A lens has to be supported only at its edges, so the lens can sag in the middle.
C. Some lens materials completely absorb short wavelengths.
D. Large lenses are expensive to fabricate.
E. All of these choices are correct.
Answer: E
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Star clusters are important to our study of stars because
a. all stars formed in star clusters. b. the sun was once a member of a globular cluster. c. they give us a method to test the our theories and models of stellar evolution. d. they are the only objects that contain Cepheid variables. e. all of the above
In the context of understanding stellar lives, "high-mass" stars have masses
A) more than about 8 times the mass of our Sun. B) more than about 3 times the mass of our Sun. C) the same as our Sun. D) more than about 100 times the mass of our Sun.
How much electrical charge is needed to raise an isolated metal sphere of radius 1.0 m to a potential of 1.0 × 106 V?
What will be an ideal response?
What energy transformation occurs during photosynthesis?
A) radiant E ? chemical E B) chemical E ? thermal E C) radiant E ? kinetic E D) thermal E ? chemical E E) chemical E ? kinetic E