DP Physics (first assessment 2025)

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Question 19M.2.HL.TZ1.2a.i

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Date May 2019 Marks available [Maximum mark: 3] Reference code 19M.2.HL.TZ1.2a.i
Level HL Paper 2 Time zone TZ1
Command term Show that Question number a.i Adapted from N/A
a.i.
[Maximum mark: 3]
19M.2.HL.TZ1.2a.i
(a.i)

Use the graph to show that the nuclear radius of silicon-30 is about 4 fm.

[3]

Markscheme

read off between 17 and 19 «deg» ✔

correct use of d =  λ sin ⁡ θ = 7.8 × 10−15 «m» ✔

so radius = 7.8 2 «fm» = 3.9 «fm» ✔

Award ecf for wrong angle in MP1.

Answer for MP3 must show at least 2 sf.

Examiners report

This question was left blank by many candidates and many of those who attempted it chose an angle that when used with the correct equation gave an answer close to the given answer of 4 fm. Very few selected the correct angle, calculated the correct diameter, and divided by two to get the correct radius.

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