Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. (Physics only) What is spectacular reflection?
   • Reflection from a smooth surface in a single direction is called specular reflection.
2. (Physics only) What is diffused reflection?
   • Reflection from a rough surface causes scattering: this is called diffuse reflection.
3. Where are rays reflected from?
   • Waves can be reflected at the boundary between two different materials.
4. What can the time taken for the reflections to reach a detector be used to determine?
   • The time taken for the reflections to reach a detector can be used to determine how far away such a boundary is. This allows ultrasound waves to be used for both medical and industrial imaging.
5. (Physics Only)How could a ray diagram to illustrate the reflection of a wave at a surface?
   • A ray diagram could be used to show a reflection using straight lines with arrows on to show the direction of the light wave. The light wave would bounce back at the same angle.
6. What happens to Ultrasound waves when they meet a boundary?
   • Ultrasound waves are partially reflected when they meet a boundary between two different media.