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A scientist investigates a radioactive sample - Edexcel - GCSE Physics - Question 2 - 2018 - Paper 1
Question 2
A scientist investigates a radioactive sample. She measures a count rate of 130 counts per minute. The average background radiation count rate in her laboratory is... show full transcript
Worked Solution & Example Answer:A scientist investigates a radioactive sample - Edexcel - GCSE Physics - Question 2 - 2018 - Paper 1
Step 1
What is the count rate due to this sample?
Answer
To find the count rate due to the radioactive sample, we need to subtract the average background radiation from the measured count rate of the sample. The calculation is as follows:
Measured count rate = 130 counts per minute Average background radiation = 10 counts per minute
Count rate due to the sample = 130 - 10 = 120 counts per minute.
Thus, the count rate due to the sample is 120 counts per minute, which corresponds to option B.
Step 2