Radioactive Decay: A radioactive substance with a half-life of 3.0 days has an initial activity of 2400 Bq. What is its activity after 6.0 days?
A. 1200 Bq
B. 1800 Bq
C. 600 Bq
D. 300 Bq
E. 150 Bq
Answer: C
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What limitation(s) make it impossible to travel between stars? I. Fuel requirements II. The tremendous distances between stars III. The finite speed at which objects can travel
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