Question 22N.2.HL.TZ0.7b
| Date | November 2022 | Marks available | [Maximum mark: 2] | Reference code | 22N.2.HL.TZ0.7b |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | b | Adapted from | N/A |
A beam of coherent monochromatic light is incident normally on a single rectangular slit. The diffraction pattern is observed on a screen.
O is the point on the screen directly opposite the slit. P and Q are the first minima on either side of the central fringe of the diffraction pattern.
The single slit is replaced by a double slit. The width of each slit in this arrangement is the same as the width of the single slit in (a).
Outline how the intensity variation observed between points P and Q will change.
[2]
intensity at O increases ✓
fringes / a series of maxima and minima ✓
with intensity decreasing away from O
OR
intensity modulated by diffraction ✓
Accept answers as sketches. For MP1 expect the scale on the y-axis.
E.g.
The most successful answers were accompanied by a diagram. It is worthy to emphasize that the presence of a blank space within the box should be taken as an indicator of the convenience of using sketches to complete the answer or communicate the ideas more easily. It was often easy to award 2 marks from the diagram, even though the new peak intensity usually was not labelled.
