0 1 . 1 Two isotopes of iodine are 125
53 I and 131
53 I.
Determine, for these two isotopes, the difference between the constituents of the
nuclei.
[1 mark]
0 1 . 2 A 131
53 I nuclide undergoes beta (β–) decay to form a xenon nuclide.
State the nucleon number of the xenon nuclide.
[1 ma...
Monday 20 May 2019 Afternoon Time allowed: 2 hours
Materials
For Examiner’s Use
For this paper you must have:
• a pencil and a ruler Question Mark
• a scientific calculator
1
• a Data and Formulae Booklet.
2
Instructions 3
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page.
5
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write 6
outside the box around each page or on blank pages. 7
• If you need extra space for your answer(s), use the lined pages at the end of 8–32
this book. Write the question number against your answer(s).
• Do all rough work in this book. Cross through any work you do not want TOTAL
to be marked.
• Show all your working.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 85.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
*JUN197408101*
IB/M/Jun19/E7 7408/1
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 . 1 125 131
Two isotopes of iodine are I and I.
53 53
Determine, for these two isotopes, the difference between the constituents of the
nuclei.
[1 mark]
0 1 . 2 131
A I nuclide undergoes beta (β–) decay to form a xenon nuclide.
53
State the nucleon number of the xenon nuclide.
[1 mark]
0 1 . 3 125
A I nuclide decays by electron capture to form a tellurium nuclide.
53
State two differences between the constituents of the iodine nucleus and the tellurium
nucleus it decays into.
[2 marks]
*02*
IB/M/Jun19/7408/1
, 3
Do not write
outside the
0 1 . 4 Internal conversion is a process in which a nucleus in an excited state can release its box
excess energy. In internal conversion all of the excess energy is transferred from the
nucleus to an orbital electron through the electromagnetic force. This orbital electron
is ejected from the atom.
The tellurium nucleus formed in question 01.3 is in an excited state and can undergo
internal conversion.
Discuss three differences between internal conversion and beta (β–) decay.
[3 marks]
1
2
3
7
Turn over for the next question
Turn over ►
*03*
IB/M/Jun19/7408/1
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