Plot a graph to verify the inverse square law and use the graph to estimate ?

nomanslan
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Hi,

I know that this is my first post, but please help me! I am having trouble with the following question

"The following data was collected from an experiment to measure the gamma ray count-rate at different distances from a sample of cobalt-60 The background count was measured five times. Background count (per minute) = 12, 14, 10, 15, 12.

Count (per minute) 413 161 92 60 43 35 26
Distance between source and detector (cm) 1.0 2.0 3.0 4.0 5.0 7.0 8.0

Plot a suitable graph to verify the inverse square law and use the graph to estimate the extra distance, d, between the source and the detector."

i have plotted the graph, but i am unsure on have to calculate the extra distance using it.

Thank you so much for all your help!
 
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Welcome to PF nomanslan!

I'm unclear on what you mean by "the extra distance" between source and detector. You measured the distance between source and detector, did you not?
 

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