Estimation the standard deviation of the number of counts

Reference no: EM138517

Q1. Identical samples containing 32P are measured for a period of 1 hr in a counter having an efficiency of 44 percent and a negligible background. From a large number of observations, the mean number of counts in 1 hr is (2.93 x 10^4)

a. what is the activity of 32P

b. estimation the standard deviation of the number of counts obtained in 1 hr

Q2. A toy train rolls around a horizontal 1.6--diameter track. The coefficient of rolling friction is 0.15.

What is the magnitude of train's angular acceleration after it is released?

How long does it take the train to stop if it's released with the angular speed of 32rpm?

Reference no: EM138517

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