Barium-137m is a radloactive form of the element barium that decays very rapidly

Question

Barium-137m is a radloactive form of the element barium that decays very rapidly. It is easy and safe to use for lab experiments in schools and colleges. In a typical experiment, the radioactivity of a sample of barium-137m is measured for one minute. It is then measured for three additional one-minute periods, separated by two minutes. So data are recorded at 1, 3, 5, and 7 minutes after the start of the first counting period. The measurement units are counts. Here are the data for one of these experiments. Time 1 3 5 7 Count 576 317 203 119 (a) Make a scatterplot of the data. Count Time 500 400 100 Count Time 0 100 200 300 400 500 600 700 800 Count Time 100 Time Count 100 200 300 400 500 600 700 800

Explanation / Answer

a)Scatter plot (4th one)

Time on X-axis and Count is on Y-axis

Time is explanatory (independent) variable which is why it is used on the X-axis

b) yes the relationship is linear

c) negative relationship between time and count

Here both the variables are deviated in the opposite directions

d) (1,576)

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