OUTCOME
By the end of this lesson you will observe and explain diffraction as the spreading of waves around a barrier.
When waves encounter a barrier they appear to bend around it. If there is a gap in a barrier, the waves will curve depending on the size of the gap and the size of the wave length
LEARNING TASKS
Explain
Diffraction of sound is common and can be heard when people are watching TV or listening to music in another room.
Explain why the beat of music may seem louder to someone in another room but not the rest of the sound
Explore and Elaborate
Prac: Diffraction in water
Evaluate
Try Ex 9.4
DPQs 1.9.1-1.9.1.6
Reading for next class: 361-363