Physics · Oct / Nov 2022 · Paper 41 · Question 9
0625
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The question as text
Only one isotope of gold occurs naturally on Earth.
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9(a)[1]
they all have the same number of neutrons / nucleons or they are all identical
9(b)(i)[2]
(number of protons =) 80
(number of neutrons =) 118
9(b)(ii)[1]
19 counts / minute ⩽ count rate ⩽ 21counts / minute
9(b)(iii)[4]
2.4 days ⩽ τ ⩽ 2.9 days
count rate from line – background count e.g. 390 – 20
answer from first C1 mark divided by 2 e.g. 370 / 2 or 185
background count + answer from second C1 mark e.g. 20 + 370 / 2 or 20 + 185 or 205
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