The last fusion product possible in stars is ________ because ________.
A. carbon; no stars are hot enough in their cores to fuse carbon nuclei
B. iron; no stars are hot enough in their cores to fuse iron nuclei
C. iron, fusing iron nuclei absorbs energy; it does not liberate it
D. lead, fusing lead nuclei absorbs energy; it does not liberate it
Answer: C
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H II emission nebula regions are found around _____________
Fill in the blank(s) with correct word
_________ occurs when light travels out of a gravitational field, loses energy, and its wavelength grows longer
a. A gravitational blue shift b. The solar wind c. A gravitational redshift d. A X-ray burst e. A pulsar wind
Suppose you try to bring two protons close together. Because of the electromagnetic force, the two protons will
A) attract one another. B) remain stationary. C) repel one another. D) collide. E) join together to form a deuterium nucleus.
Which of the following is true?
1.A moving car with constant acceleration can never stop and stay stopped. 2.If a car is traveling eastward, its acceleration is eastward. 3.If a car is slowing down, its acceleration must be negative. 4.If a car is speeding up, its acceleration must be greater than zero.