If the total energy of an electron in an accelerator is five times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 1.98 × 10^8 m/s
c. 2.32 × 10^8 m/s
b. 2.94 × 10^8 m/s
d. 2.90 × 10^8 m/s
B
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What part of the Sun's aging process will disrupt the biosphere and evaporate the oceans of Earth?
a. the fusion of hydrogen in the core b. an increase in luminosity as the core becomes helium-enriched c. the expansion of the outer layers of the Sun as a red giant d. the supernova explosion caused by the collapse of the iron core e. hydrogen detonation on the white dwarf remnant
How many neutrons are in a 
nucleus?
A. 79 B. 179 C. 118 D. Some other number (specify)
Most standalone digital cameras, and virtually all smartphones, include ______ or other wireless transfer capabilities.
A. infrared B. radio waves C. Bluetooth D. microwaves
Why are fossils of early life on Earth more rare than fossils of plants and animals from the past few hundred million years?
A) Life was far less abundant prior to a few hundred million years ago. B) Early organisms lacked skeletons and other hard structures that are most likely to be fossilized. C) Fossils could not form before there was oxygen in the atmosphere. D) We find fossils in sedimentary layers, and no sediments were deposited until just a few hundred million years ago.