1. Here are four uses of radioactivity - Edexcel - GCSE Physics - Question 1 - 2013 - Paper 1
Question 1
1. Here are four uses of radioactivity.
Draw a line from each one of them to the type of radiation it uses.
Each type of radiation may be chosen once, more than once... show full transcript
Worked Solution & Example Answer:1. Here are four uses of radioactivity - Edexcel - GCSE Physics - Question 1 - 2013 - Paper 1
Step 1
sterilisation of medical equipment
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Answer
Alpha radiation is used for sterilisation of medical equipment due to its ability to kill bacteria and other microorganisms.
Step 2
household fire (smoke) alarm
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Answer
Beta radiation is commonly utilized in household fire alarms because it can detect smoke particles effectively.
Step 3
gauging thickness of cardboard
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Answer
Gamma radiation is ideal for gauging the thickness of cardboard as it can penetrate materials and provide precise measurements.
Step 4
irradiating food
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Answer
Gamma radiation is also used for irradiating food, helping to eliminate pathogens and increase shelf life.
Step 5
Which graph best shows how the activity of a radioactive isotope changes with time?
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Answer
The correct answer is B. This graph represents the expected decay pattern of radioactive isotopes, where activity decreases over time.
Step 6
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct answer is B, becquerel, which is the unit of measurement for radioactive activity.
