0625/41/M/J/24 · question 2 of 3 in this topic
The isotope thallium-208 (²⁰⁸₈₁Tl) is radioactive. It decays by β-decay to an isotope of lead (Pb).
Complete the equation for this decay.
²⁰⁸₈₁Tl → ...... Pb + ...... β (give the nucleon and proton numbers for the lead nucleus and the β-particle)
Complete Fill in every gap. A partly completed answer usually scores partly.
Your answer
Suggested time: 5 min
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.
Explain why this γ-emission does not affect the numbers in the decay equation.
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
Your answer
Suggested time: 2 min
The isotope thallium-208 (²⁰⁸₈₁Tl) is radioactive.
Suggest one reason why a nucleus of thallium-208 is unstable.
Suggest More than one answer may be acceptable, so long as it is consistent with the physics.
Your answer
Suggested time: 2 min
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
• draw a line labelled γ to indicate the path of the γ-radiation in the magnetic field.
Your answer
Suggested time: 5 min
0625/41/M/J/24Cambridge IGCSE Physics 0625 · May/June 2024 · Paper 4 variant 1 · sit the whole paper