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A-Level OCR 2025 Physics B (Advancing Physics) Paper 2
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Monday 9 June 2025 – Morning
A Level Physics B (Advancing Physics)
H557/02 Scientific literacy in physics
Time allowed: 2 hours 15 minutes
1
Turn over
, 2
SECTION A
1 This question is about measuring the sizes of atoms and using the structure of materials on a
microscopic scale to explain large‑ scale properties.
(a) Fig. 1 shows an image of a sheet of gold atoms. Use the image to determine the radius of a gold
atom. Explain your choice of the number of significant figures in your answer.
Fig. 1
1.0 nm
radius =.....................................................................m
..........................................................................................................................................................
...................................................................................................................................................................... [3]
(b) An estimate of the radius of a gold atom can be calculated from the density of gold.
One mole of gold contains 6.02 × 1023 atoms.
The mass of one mole of gold is 0.197 kg. The density of gold is 19 320 kg m–3.
(i) Show that there are approximately 6 × 1028 gold atoms m–3.
[2]
© OCR 2025
, 3
(ii) The manner in which the gold atoms are packed together means that only 74% of the volume
of a sample of gold is taken up by the atoms themselves. Use this percentage and your answer
from (i) to calculate the radius of a gold atom.
Assume that gold atoms are spherical.
radius of atom =.............................................................. m [2]
(c) Images of arrangements of atoms in a metal sometimes reveal dislocations in the microscopic
structure. Describe what dislocations are and how the presence of dislocations changes the
properties of the metal.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [3]
© OCR 2025 Turn over
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ooOxford Cambridge and RSAaaa
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A-Level OCR 2025 Physics B (Advancing Physics) Paper 2
Uytfvhb tjgcttc bvytcg yttfyfntg nbjugyfdt8ygyfg i87yg o88 hvv buyrsdh iutyun iuujviug i876uhb I
Monday 9 June 2025 – Morning
A Level Physics B (Advancing Physics)
H557/02 Scientific literacy in physics
Time allowed: 2 hours 15 minutes
1
Turn over
, 2
SECTION A
1 This question is about measuring the sizes of atoms and using the structure of materials on a
microscopic scale to explain large‑ scale properties.
(a) Fig. 1 shows an image of a sheet of gold atoms. Use the image to determine the radius of a gold
atom. Explain your choice of the number of significant figures in your answer.
Fig. 1
1.0 nm
radius =.....................................................................m
..........................................................................................................................................................
...................................................................................................................................................................... [3]
(b) An estimate of the radius of a gold atom can be calculated from the density of gold.
One mole of gold contains 6.02 × 1023 atoms.
The mass of one mole of gold is 0.197 kg. The density of gold is 19 320 kg m–3.
(i) Show that there are approximately 6 × 1028 gold atoms m–3.
[2]
© OCR 2025
, 3
(ii) The manner in which the gold atoms are packed together means that only 74% of the volume
of a sample of gold is taken up by the atoms themselves. Use this percentage and your answer
from (i) to calculate the radius of a gold atom.
Assume that gold atoms are spherical.
radius of atom =.............................................................. m [2]
(c) Images of arrangements of atoms in a metal sometimes reveal dislocations in the microscopic
structure. Describe what dislocations are and how the presence of dislocations changes the
properties of the metal.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [3]
© OCR 2025 Turn over
