2024 · M/J · 0625/41 | Q8

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Question (8 of 9)8 marks · Practise this topic →

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Available practice: 43 of 80 marks. Parts 1(b), 1(c)(ii), 2(a)(i), 2(a)(ii), 3(b)(ii), 3(b)(iv), 4(b)(i), 5(b)(ii), 5(b)(iii), 6(b)(i), 6(b)(ii), 7(a), 7(b)(ii), 9(a), 9(b) await marking support. Scores cover available parts only.

The isotope thallium-208 (²⁰⁸₈₁Tl) is radioactive. It decays by β-decay to an isotope of lead (Pb).

Complete the equation for this decay.

(a)(i)²⁰⁸₈₁Tl → ...... Pb + ...... β (give the nucleon and proton numbers for the lead nucleus and the β-particle)

Answer guidance

Complete Fill in every gap. A partly completed answer usually scores partly.

[3 marks]

Thallium-208 decays by β-decay to an isotope of lead. The β-emission of thallium-208 is accompanied by γ-emission from the nucleus.

(a)(ii)Explain why this γ-emission does not affect the numbers in the decay equation.

Answer guidance

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

[1 mark]

The isotope thallium-208 (²⁰⁸₈₁Tl) is radioactive.

(a)(iii)Suggest one reason why a nucleus of thallium-208 is unstable.

Answer guidance

Suggest More than one answer may be acceptable, so long as it is consistent with the physics.

[1 mark]

A sample of thallium-208 is placed in a thick lead container.

The narrow beam enters a region where there is a magnetic field that is directed into the page.

On Fig. 8.1:

• draw a line labelled β to indicate the path of the β-particles in the magnetic field

(b)• draw a line labelled γ to indicate the path of the γ-radiation in the magnetic field.

Fig. 8.1 — see the question text for what it shows

[3 marks]

0625/41/M/J/24Cambridge IGCSE Physics 0625 · May/June 2024 · Paper 4 variant 1 · Question 8