If 18 g of a radioactive substance are present initially and 9 yr later only 9 g remain, how much of the substance will be prese
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ANSWER
EXPLANATION
The frequency of a wave function refers to the number of times the graph repeats its cycle within the interval [0,2π]
We can observe explicitly from the graph that the frequency is half.
The period of the given function is 4π
Hence the frequency is half.
