Quick questions on Half-life and uses of radioactive decay (VCE Physics Unit 1)

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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Define half-life and state the SI unit. [2 marks]

What is q2?

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A medical

^{131}

I sample (half-life

8.0

days) has an initial activity of

200

MBq. Calculate (a) the activity after

24

days, and (b) the time at which activity falls to

12.5

MBq. [2+2 marks]

What is q3?

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Refer to ANSTO production. (a) Calculate the fraction of

^{99}

Mo remaining after

24

hours given a

66

hour half-life. (b) Determine the activity ratio of

^{99}

mTc daughter to

^{99}

Mo parent at secular equilibrium.

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