How many Radioactive decay questions are there for 9702?

This page collects 9 recent Cambridge Physics (9702) past-paper questions tagged to Radioactive decay. Each links straight to instant marking against the official 9702 scheme.

How are Radioactive decay answers marked?

Type or photograph your working and MarkScheme scores it against the real 9702 mark scheme for this topic — method, accuracy and any band descriptors — so you see exactly where the marks are.

Where can I learn Radioactive decay first?

Start with the free Physics lesson on Radioactive decay, then come back and drill past-paper questions under timed conditions.

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9702 · topic questions

Radioactive decay

Physics9 questions

9 past-paper questions on Radioactive decay

9702/41 · October/November 20244 marks
On Fig. 4.3, sketch the variation of h with time t from t = 0 to t = 6.0s.
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9702/42 · May/June 20253 marks
Determine, in terms of T, the time at which the two samples will have equal activities.
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9702/22 · May/June 20253 marks
Nucleus X undergoes β⁻ decay to form nucleus Z. Complete the equation representing this decay.
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9702/41 · October/November 20243 marks
Determine the activity of 2.1 × 10⁻¹²kg of fluorine-18.
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9702/23 · May/June 20242 marks
This isotope of samarium is radioactive and decays by emitting particles. Gamma-radiation is not emitted. The energy spectrum of…
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9702/22 · May/June 20252 marks
A sample of a radioactive substance emits particles that are positively charged and have a continuous range of kinetic energies.…
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9702/23 · May/June 20252 marks
In β⁻ decay, a neutron decays to form a proton. Theory predicts that an antineutron should decay to form an antiproton. A…
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9702/22 · October/November 20242 marks
State the names of the particles emitted as Q decays to form R.
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9702/41 · October/November 20242 marks
Suggest why 110 minutes is a suitable half-life for a nuclide used as a tracer in medical diagnosis.
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Question stems are shortened previews. Open a question to attempt the full version and have it marked.

Worked example

What a lost mark actually looks like

This answer reaches the right coordinates and still drops a mark — the conclusion is stated, but never justified. Examiners pay for the reasoning, not the answer.

MARKED

80%

Strong

M1dy/dx = 3x^2 - 12x + 9M1 earned
M1(x - 1) $(x - 3) = 0$ M1 earned
A1 $x = 1$ or $x = 3$ A1 earned
B1(1, 5) is a maximum and (3, 1) is a minimumB1 not earned

B1 — withheld
You stated the nature of each point correctly, but stated it without justification. This mark needs the reasoning shown — either evaluate the second derivative (d²y/dx² = 6x − 12, giving −6 at $x = 1$ and +6 at $x = 3$ ) or show a sign change of dy/dx either side of each point. An unsupported assertion earns nothing here even when the conclusion is right.

Radioactive decay (9702) past-paper questions — marked instantly

These are real Cambridge Physics past-paper questions on Radioactive decay. Open one, attempt it, then upload your working — MarkScheme grades it against the official 9702 mark scheme so you see exactly where the marks are won and lost on this topic.

Mark your answer →Learn Radioactive decay 9702 grade boundaries

Frequently asked questions

How many Radioactive decay questions are there for 9702?: This page collects 9 recent Cambridge Physics (9702) past-paper questions tagged to Radioactive decay. Each links straight to instant marking against the official 9702 scheme.
How are Radioactive decay answers marked?: Type or photograph your working and MarkScheme scores it against the real 9702 mark scheme for this topic — method, accuracy and any band descriptors — so you see exactly where the marks are.
Where can I learn Radioactive decay first?: Start with the free Physics lesson on Radioactive decay, then come back and drill past-paper questions under timed conditions.