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MYP Physics

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A.2 Applications & Nuclear Energy

Practice Worksheet — name: ______________________ date: ____________

Section A — Multiple choice

A1. Which process powers the Sun?

  1. A Nuclear fission
  2. B Nuclear fusion
  3. C Chemical combustion
  4. D Radioactive decay

A2. Why is a radioactive tracer used in medicine?

  1. A It kills cancer cells
  2. B It can be tracked to monitor organ function
  3. C It strengthens bones
  4. D It improves blood circulation

Section B — Short answer

B1. Distinguish between nuclear fission and fusion.

B2. Give one medical use of gamma rays and explain why their properties are suitable.

Answer key

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Section A

A1: Nuclear fusion

A2: It can be tracked to monitor organ function

Section B

B1: Fission is the splitting of a heavy nucleus into two lighter nuclei, releasing energy. Fusion is the joining of two light nuclei to form a heavier nucleus, also releasing energy.

B2: Gamma rays are used to sterilise surgical equipment because they are highly penetrating and kill bacteria without making the equipment radioactive.