4 (a) (i) When cobalt-60 decays it releases high energy gamma rays - Edexcel - GCSE Physics - Question 4 - 2016 - Paper 1
Question 4
4 (a) (i) When cobalt-60 decays it releases high energy gamma rays.
Which of these is a correct use of gamma rays?
Put a cross (X) in the box next to your answer.
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Worked Solution & Example Answer:4 (a) (i) When cobalt-60 decays it releases high energy gamma rays - Edexcel - GCSE Physics - Question 4 - 2016 - Paper 1
Step 1
Put a cross (X) in the box next to your answer.
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Answer
The correct answer is C. Sterilising hospital equipment. Gamma rays are widely used for sterilization due to their ability to kill bacteria and viruses.
Step 2
Explain why gamma rays are dangerous.
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Answer
Gamma rays are dangerous because they have high energy and can penetrate deep into materials, including human tissues. This can lead to cellular damage and increase the risk of cancer. Prolonged exposure to gamma radiation can cause severe health effects, including radiation sickness.
Step 3
Calculate the mass of cobalt-60 remaining after 10 years.
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Answer
To calculate the remaining mass of cobalt-60 after 10 years, we use the half-life formula:
After each half-life (5 years), the mass of cobalt-60 will be halved. Thus, after 10 years (which consists of two half-lives), the calculation is:
