Radioactive Decay: Suppose the half-life of an isotope is 2 days. You purchase 10 grams of the isotope, but it was produced in a laboratory 4 days before it was delivered to you. How much of this isotope will you have 3 days after it was delivered to you?

A. more than 2.5 grams but less than 5 grams
B. 2.5 grams
C. more than 1.25 grams but less than 2.5 grams
D. 1.25 grams
E. less than 1.25 grams


Answer: E

Physics & Space Science

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The absence of oxygen on Mars means that it has very little

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A body of mass 1 kg is pushed across a horizontal table by a force of 1 N. The observed acceleration is 0.7 m/s2. The force of friction opposing the motion is ________ N.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science