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One of the problems of in-air testing of nuclear weapons (or, even worse, the use of such weapons!) is the danger of radioactive fallout. One of the most problematic nuclides in such fallout is strontium -90 (90^Sr), which breaks down by B- decay with a half-life of 28 years. It is chemically similar to calcium and therefore can be incorporated into bones and teeth, where, due to its rather long half-life, it remains for years as an internal source of radiation.
Part A What percent of the original level of is left after 56 years?
Part B How long would you have to wait for the original level to be reduced to 0.781% of its original value?
t=_____________ years
With the power supply disconnected, the dielectric material is removed and the potential difference between the plates is measured to be 500 V. What is the dielectric constant of the material that was at first used to fill the gap between the plates.
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Find out the distance between the point of firing and the point at which the 2.6-kg fragment strikes the ground.
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