X-Ray - Assessment

1.

Multiple Choice

2 mins

1 pt

Why is it critical to correctly determine the sample Z position?

I don’t know

To fulfill diffraction condition

To measure angles correctly

2.

Multiple Choice

2 mins

1 pt

Which spectrum line has the shortest wavelength?

K-alpha1

K-alpha2

K-beta

I don’t know

3.

Multiple Choice

2 mins

1 pt

The diffraction peak (111) from a sample has the largest 2theta angle for:

K-beta

K-alpha2

K-alpha1

I don’t know

4.

Multiple Choice

2 mins

1 pt

Which of the following diffraction peaks from a sample has the greatest 2theta angle (100), (110) or (111)?

(100)

I don’t know

(111)

(110)

5.

Multiple Choice

2 mins

1 pt

Why do we need a beta filter and what does it do?

To decrease amount of diffraction peaks by suppressing K-alpha spectrum line

To decrease amount of diffraction peaks by suppressing K-beta spectrum line

I don’t know

6.

Multiple Choice

2 mins

1 pt

Diffraction vector K has direction

Along vector sum of k-vectors for incident and diffracted beams

Along bisect between incident and diffracted beams

I don’t know

7.

Multiple Choice

2 mins

1 pt

Laue and Bragg equations determine condition for:

Constructive diffraction (CD) of all atoms in 3D periodical lattice

CD of all atoms in simple 3D periodical lattice without motif

I don’t know

8.

Multiple Choice

2 mins

1 pt

Structure factor was introduced to calculate intensity of peaks considering

I don’t know

Type of atoms and their location insight the unit cell

3D symmetry of crystal

Absorption coefficient of the sample

9.

Multiple Choice

2 mins

1 pt

Why we use reciprocal lattice and space to describe diffraction phenomena?

Because Bragg law requests this

I don’t know

Constrictive diffraction criterion K*R=integer requests this

10.

Multiple Choice

2 mins

1 pt

Why is the crystal not rotated in the Laue diffraction method?

Because we use monochromatic radiation

I don’t know

Because we use polychromatic radiation

11.

Multiple Choice

2 mins

1 pt

Why is it not necessary to rotate the crystal in the powder diffraction method?

Because of the varied orientations of the particles

Because we use monochromatic radiation

Because we use polychromatic radiation

I don’t know

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