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5.2.4a Half-life

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Question 1

Radioactive sources emit α\alphaα-(alpha), β\betaβ-(beta) and γ\gammaγ-(gamma) radiations.

a.

State which of these types of radiation is stopped by a thin sheet of paper.

[1]
b.

Iodine-131 is a radioactive isotope. The nuclide notation for iodine-131 is:

053131I ^{131}_{\phantom{0}53}\text{I} 053131​I

Determine the number of neutrons in a nucleus of iodine-131.

[2]
c.

A radioactive source contains 80 mg80\text{ mg}80 mg of an isotope that has a half-life of 8 days8\text{ days}8 days.

Calculate the mass of the isotope that remains in the source after 24 days24\text{ days}24 days.

[3]
Markscheme

5.2.4a Half-life Questions

  1. IGCSE
  2. /Physics
  3. /5.2.4a Half-life

144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.

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