An electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass. This pair annihilation is an example of
a. time dilation.
b. length contraction.
c. the equivalence of mass and energy.
d. the principle of relativity.
e. none of the above.
c
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A. RWD B. SEO C. ROI D. CTA
The height of the quasar epoch was
A) less than 1 billion years ago. B) when there was still sufficient mass to fuel the supermassive black holes at their center. C) before the formation of galaxies. D) 5 billion years ago. E) before mass had a chance to accumulate at the nucleus.
Which of the following are advantages offered by the thorium nuclear reactor?
A) operates at relatively low temperatures B) produces isotopes of short radioactive half-lives C) difficult to use for bomb making D) All of the above.
The earliest evidence of ancient life, blue-green algae, are
a. cyanobacteria. b. amber. c. foraminifera. d. coal.