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
...
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 mark]
0 1 . 3 A 125
53 I nuclide decays by electron capture to form a tellurium nuclide.
State two differences between the constituents of the iodine nucleus and the tellurium
nucleus it decays into.
[2 marks]
3
*03*
Turn over ►
IB/M/Jun19/7408/1
Do not write
outside the
box 0 1 . 4 Internal conversion is a process in which a nucleus in an excited state can release its
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
Turn over for the next question
7
4
*04*
IB/M/Jun19/7408/1
Do not write
outside the
0 2 box Some cars are fitted with a water sensor designed to switch on windscreen wipers
automatically when it rains. Figure 1 shows a simplified diagram of the sensor.
Figure 1
A light ray travels fro
[Show More]