Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. Why are elements with even numbers of protons more abundant, on average, than elements with odd numbers of protons?
A) because elements are mainly made in reactions with helium nuclei
B) Because when elements split in a fission reaction, they prefer to split with all the protons paired.
C) There's no explanation, it's something of a mystery to be explained, or it may be a coincidence.
D) because elements are mainly made in reactions with hydrogen nuclei
A) because elements are mainly made in reactions with helium nuclei
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A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
A gas can containing a gallon of gasoline is stored in a basement. This gasoline contains
A) both work and energy. B) neither work nor energy. C) work. D) both energy and power. E) energy.
When a magnetic field causes a charged particle to move in a circular path, the only quantity listed below which the magnetic force changes significantly as the particle goes around in a circle is the particle's:
a. energy. b. momentum. c. radius for the circle. d. time to go around the circle once.
How can a half-life be used to tell the age of a sample?
A) The half-life of an isotope is constant. B) The amount of radioactive form depends on the amount of radiation in the surroundings. C) The ratio between the radioactive form and the stable form depends on the archaeological record. D) The ratio between the radioactive form and stable form varies regularly with time. E) both C and D