DP Physics (first assessment 2025)

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Question 23M.2.HL.TZ2.9ci

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ2.9ci
Level HL Paper 2 Time zone TZ2
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23M.2.HL.TZ2.9ci
(i)

The smallest mass of magnesium that can be detected with this technique is 1.1 × 10−8 kg.

Show that the smallest number of magnesium atoms that can be detected with this technique is about 1017.

[2]

Markscheme

So 1.1 × 10−8 kg ≡ 1.10.027 × 10−8 «mol»

OR

Mass of atom = 27 × 1.66 × 10−27 «kg» ✓

2.4 − 2.5 x 1017 atoms ✓

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