22. In an experiment to find the range of -particles in air, the apparatus below was...

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22. In an experiment to find the range of -particles in air, the apparatus below was used. -particle source detector ruler The results of this experiment are shown below. count rate /(counts/minute) 681 562 441 382 317 20 19 21 19 distance from source to detector/cm 1 2 3 4 5 6 7 8 9 a) State what causes the count rate 9 cm from the source. b) Estimate the count rate that is due to the source at a distance of 2 cm. c) Suggest a value for the maximum distance that a-particles can travel from the source. Justify your answer. 22. In an experiment to find the range of -particles in air, the apparatus below was used. -particle source detector ruler The results of this experiment are shown below. count rate /(counts/minute) 681 562 441 382 317 20 19 21 19 distance from source to detector/cm 1 2 3 4 5 6 7 8 9 a) State what causes the count rate 9 cm from the source. b) Estimate the count rate that is due to the source at a distance of 2 cm. c) Suggest a value for the maximum distance that a-particles can travel from the source. Justify your answer.