The probability for a radioactive particle to decay between time
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- Idkarrow_forwardThe rate of disintegration of a radioactive substance is proportional to the amount of the substance present at any instant. In 1962, an experiment on Strontium-90 (Sr90), a radioactive substance usually found in nuclear fall out, was started. A certain amount (in grams) of Sr90 was initially placed in a sealed container. In 1987, it was found that the Sr90 had reached its half-life. Further, it was observed that 7.5 grams remained in the container in 1970. How much Sr90 was initially stored for the experiment? How many years after half-life will it take to reduce the substance to just 12% of its initial valuearrow_forwardPlease Help ASAP!!!arrow_forward
- Chlorophylls a and b are plant pigments that absorb sunlight and transfer the energy into photosynthesis of carbohydrates from CO2 and H2O, releasing O2 in the process. Chlorophylls were extracted from chopped up grass and measured by spectrophotometry. The table shows results for chlorophyll a for four separate analysis of five blades of grass. Chlorophyll a (g/L) Blade 1 Blade 2 Blade 3 Blade 4 Blade 5 1.09 1.26 1.1 1.23 0.85 0.86 0.96 1.21 1.3 0.65 0.93 0.8 1.27 0.97 0.86 0.99 0.73 1.12 0.97 1.03 Four replicate measurements for each blade of grass tell us the precision of the analytical procedure (sanalysis). Differences between mean values for each of the five blades of grass are a measure of variation due to sampling (ssampling). Using Excel and it’s ANOVA function, find the standard deviations attributable to sampling and to analysis, as well as the overall standard deviation arising from both sources.arrow_forwardThe following table shows the cumulative number of cases of SARS (severe acute respiratory syndrome) on selected days during the outbreak in 2003. Here t is time in days since the beginning of April and N is the cumulative number of cases reported by time t. t 19 22 24 29 N 3547 3947 4439 5642 Approximate the value of dN/dt at t=19 using the average rate of change from t=19 to t=22.a. 155.55 cases per dayb. 144.44 cases per dayc. 133.33 cases per dayd. 122.22 cases per dayarrow_forwardNeeds complete typed solution with 100% accuracy.arrow_forward
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