People who work around radioactivity wear film badges to monitor the amount of radiation that reaches their bodies. These badges consist of small pieces of photographic film enclosed in a light-proof wrapper. What kind of radiation do these devices monitor?
A. alpha radiation
B. gamma radiation
C. beta radiation
D. all of the above
Answer: B
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All of the following are found in chromosomes except
A. proteins. B. RNA. C. DNA. D. histones.
The pattern by which communicable diseases (including HIV/AIDS) spread is usually by a combination of expansion and hierarchical diffusion
Indicate whether this statement is true or false.
The region of greatest tornado activity shifts northward from early spring to summer. Why does this occur?
What will be an ideal response?
One of the main topics discussed in the opening two-page spread of Chapter 1 (The Nature of Earth Science) was
A. a huge meteorite impact caused the dinosaurs to become extinct. B. that volcanoes have dramatically changed the atmosphere over time. C. that the two sides of North America are very different. D. All of these were mentioned.