DP Chemistry (last assessment 2024)

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Question 19N.3.hl.TZ0.7

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.hl.TZ0.7
Level hl Paper 3 Time zone TZ0
Command term Calculate Question number 7 Adapted from N/A
7.
[Maximum mark: 1]
19N.3.hl.TZ0.7

X-ray crystallography of a metal crystal produces a diffraction pattern of bright spots.

Using X-rays of wavelength 1.54 × 10−10 m, the first bright spots were produced at an angle θ of 22.3° from the centre.

Calculate the separation between planes of atoms in the lattice, in meters, using section 1 of the data booklet.

[1]

Markscheme

«d = nλ2sin θ»

d = «1×1.54×10−10m2×sin 22.3∘» 2.03 × 10−10 «m» ✔

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