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5.2.4a Half-life

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Question 43

A nucleus of caesium-137 is represented using nuclide notation as shown.

55137Cs ^{137}_{55}\text{Cs} 55137​Cs
a.

Calculate the number of neutrons in one nucleus of caesium-137.

[1]
b.

Determine the number of electrons in one neutral atom of caesium-137.

[1]
c.

Caesium-137 decays by emitting β\betaβ-particles (beta-particles).

Describe the nature of β\betaβ-particles.

[1]
d.

Caesium-137 decays with a half-life of 30 years. A sample contains 24 mg24\text{ mg}24 mg of caesium-137.

Calculate the time taken for the caesium-137 to decay until only 3.0 mg3.0\text{ mg}3.0 mg of caesium-137 remains in the sample.

[2]
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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