5.2.4a Half-life

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Question 42

A radioactive nucleus of tritium decays to a nucleus of helium-3 by emitting a particle. Complete the nuclide equation to find the values of $A$ and $Z$ , and state the name of particle $X\text{X}$ :

^{3}_{1}\text{H} \longrightarrow\ ^{3}_{2}\text{He} + \ _{Z}^{A}\text{X}

[3]

A radiation detector in a laboratory records a reading of $counts/min15\text{ counts/min}$ . There are no experimental radioactive samples present in the laboratory. Explain why the detector records a reading and suggest one possible source.

[2]

Tritium has a half-life of $years12\text{ years}$ . A fresh sample of tritium-labeled water in this laboratory gives a reading of $counts/min95\text{ counts/min}$ . An equivalent older water sample of the same volume and initial concentration gives a reading of $counts/min30\text{ counts/min}$ . It is suggested that the age of the older water sample is $years24\text{ years}$ . Perform a calculation to check whether this suggestion is correct.

[4]

A radioactive nucleus of tritium decays to a nucleus of helium-3 by emitting a particle. Complete the nuclide equation to find the values of $A$ and $Z$ , and state the name of particle $X\text{X}$ :

^{3}_{1}\text{H} \longrightarrow\ ^{3}_{2}\text{He} + \ _{Z}^{A}\text{X}

[3]

[2]

5.2.4a Half-life

Question 42

Markscheme

5.2.4a Half-life

Question 42

Markscheme

5.2.4a Half-life

Question 42

5.2.4a Half-life Questions

5.2.4a Half-life

Question 42

5.2.4a Half-life Questions