Edexcel Gcse Physics/additional Science - Unit P2 Physics For Your Future Page 33
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(d) Some scientists carry out an experiment to measure
the radioactivity from a source to be used in a
factory.
They measure the background radiation before and
after their experiment.
They take the background count at the same place
as they do their experiment.
Explain how this procedure helps to make sure that
the results of the experiment are valid. (6 marks)
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