Supose the frequencies u  ear can respond range over a factor of 103, from around 20 Hz to 20 kHz. Suppose the speedometer measured speeds differing by the same factor of 103, and the greatest speed it reads is 90.0 mph . What is  the slowest nonzero speed it could read, in  mi/h?

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Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.