A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per minute. If the Geiger counter is moved closer, half-way to the source, the counting rate will be
A) 25 counts/min.
B) 50 counts/min.
C) 100 counts/min.
D) 200 counts/min.
E) 400 counts/min.
Answer: E
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The biological damage caused by radioactive materials is due to
A) nuclear fusion occurring within biological cells. B) thermal energy created by radioactive decay within biological cells. C) nuclear fission occurring within biological cells. D) the fast-moving daughter nuclei [or residual nuclei] passing through biological cells. E) the fast-moving alpha, beta, and gamma particles passing through biological cells.
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Indicate whether the statement is true or false
After a full moon, about how long is it until the next new moon?
A. a week B. 6 hours C. 2 weeks D. a month