February/March 2026 Paper 42

2026 · 10 questions · 49 parts · 100 marks

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1(a)1(b)(i)1(b)(ii)1(b)(iii)1(c)

–/10 mks

2(a)2(b)(i)2(b)(ii)2(c)(i)2(c)(ii)2(d)2(e)

–/12 mks

3(a)3(b)3(c)

–/8 mks

4(a)4(b)(i)4(b)(ii)4(b)(iii)4(c)

–/9 mks

5(a)5(b)5(c)(i)5(c)(ii)

–/7 mks

6(a)6(b)(i)6(b)(ii)6(c)(i)6(c)(ii)

–/11 mks

7(a)7(b)(i)7(b)(ii)7(c)(i)7(c)(ii)7(c)(iii)

–/10 mks

8(a)8(b)(i)8(b)(ii)8(b)(iii)

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9(a)9(b)(i)9(b)(ii)9(b)(iii)9(c)

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Q10

10(a)(i)10(a)(ii)10(b)(i)10(b)(ii)10(b)(iii)

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9(a)Radioactive Decay Nuclear EquationsEasy2 marks

State what is meant by radioactive decay.

Answer

0 words

9(b)(i)Half Life Exponential DecayEasy2 marks

An isotope X is radioactive and decays to a stable product with a half-life of

12.0 minutes

. A sample of X has an activity of

5.80 \times 1 0^{14} Bq

at time

t = 0

. Calculate the decay constant of X. Give a unit with your answer.

decay constant =

unit

9(b)(ii)Half Life Exponential DecayEasy2 marks

Calculate the activity of the sample at

t = 20.0 minutes

9(b)(iii)Half Life Exponential DecayMedium3 marks

On Figure 9.1, sketch the variation of the activity

A

of the sample with

t

between

t = 0

and

t = 20.0 minutes

Draw with the mouse or a finger.

9(c)Radiation Properties Uses SafetyMedium3 marks

A scientist uses a radiation detector to determine the measured count rate of radiation emitted by the sample in 9(b). Explain why the measured count rate at any given time is less than the activity of the sample.

Answer

0 words