When food is irradiated with gamma rays from a cobalt-60 source, does the food become radioactive? Why?
A) Yes. This is why irradiation with cobalt-60 is no longer approved by the FDA.
B) Yes. However, the radioactivity resulting is well below the danger level established by the FDA.
C) No. The gamma rays do not have sufficient energy to initiate the nuclear reaction in the atoms of the food.
D) Yes and No. Although the gamma rays initiate the nuclear reaction the radioactivity does not show up until the food is ingested.
C
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A) fact. B) hypothesis. C) law or principle. D) theory. E) none of the above
____________________ ripple marks form in response to wind or water moving in one direction. Fill in the blank(s) with the appropriate word(s)
Public housing
A) has kept pace with demand. B) is only necessary in developing nations. C) as high-rise concentrated living was successful in both Chicago and St. Louis. D) demand outpaces supply. E) is only found on an urban periphery.
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A) Equatorial (0 to 5 degrees) B) 5 to 30 degrees C) 30 degrees D) 30 to 60 degrees E) 60 degrees F) 60 to 90 degrees G) Poles (90 degrees)