In an experiment to measure the half-life of a radioactive element, the following results were obtained: 

Count rate (per minutes

400

  200

 100

 50

 25 

 Time (in minutes)

0

 2

 4

 6

 8

Plot a graph between the count rate and time in minutes. Measure the value for the half-life of the element from the graph. Ans. (half-life is 2 minutes)



Data Given:


Count rate per minutes

400

  200

 100

 50

 25 

 Time (in minutes)

0

 2

 4

 6

 8



To Find:


To Plot a graph



Solution:


Scale : 
Along X-Axis:    One big division = 2 minutes

Along y-Axis:    One big division = 100 counts per minute

The required Graph according to the given data is below




This graph clearly shows the half-life of the radioactive element is 2 minutes.