L3 - Diffraction

OUTCOME

By the end of this lesson you will observe and explain diffraction as the spreading of waves around a barrier.

Reading p.361-364



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