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5.2 Radioactivity

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Question 71

The half-life of the radioactive isotope iodine-131 (53131I^{131}_{53}\text{I}53131​I) is 8 days8\text{ days}8 days.

Starting with 24 g of the isotope, which mass of the isotope remains after 24 days24\text{ days}24 days?

A

8.00 g8.00\text{ g}8.00 g

B

6.00 g6.00\text{ g}6.00 g

C

3.00 g3.00\text{ g}3.00 g

D

1.50 g1.50\text{ g}1.50 g

Markscheme

5.2 Radioactivity Questions

  1. IGCSE
  2. /Physics
  3. /5.2 Radioactivity

484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.

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