Radioactive decay, half-life and uses

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Question 31
Easy

A Geiger-M'ller (G-M) tube and counter are used to measure the radiation from a radioactive rock sample.

A student records the cumulative count on the detector every 30 seconds for 150 seconds. The student plots the readings and draws a straight line of best fit.

A line graph showing "Counter reading" on the y-axis and "Time in s" on the x-axis. The y-axis scales from 0 to 1500 with major increments every 100 units. The x-axis scales from 0 to 160 with major increments every 20 seconds. Data points plotted are: (0, 0), (30, 280), (60, 550), (90, 810), (120, 1100), and (150, 1350). A straight line of best fit has been drawn starting from the origin (0, 0) and directly passing through the point (150, 1350).

Time in sCounter reading
00
30280
60550
90810
1201100
1501350

Calculate the average count rate, in counts/s, using the line of best fit.

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Radioactive decay, half-life and uses Questions

  1. GCSE
  2. /Physics
  3. /Radioactive decay, half-life and uses