A radioactive substance Technetium-99 is also used by physicians to examine blood flow to
specific organs and assess organ function or bone growth. It has a very short half-life of about 6
hours. The fraction of this material that would remain after 30 hours will be-
a) 1/32
b) 1/5
c) 1/2
d) 4/5
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Answer:
The answer is option c. i.e. 1/2
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