OUTCOME
By the end of the lesson you will recognise that sound interferes resulting in areas of loudness (antinodes) and softness (nodes). You will recognise and be able to explain resonance.
Standing waves appear to stand still on a spring but are the result of two moving waves and interference
An object resonates when the entire material vibrates to create a standing wave in the object. The timbre of an instrument is a result of resonance
LEARNING TASKS
Explain
Explore and Elaborate
Prac: Standing waves and measuring the speed of waves on a spring Demo: Singing wine glasses
Demo: Resonance in a tube
How can we find the speed of sound in gas from this experiment?
Evaluate
1. What is a standing wave?
2. what is a node and an antinode?
Make sure you answer all of the questions from the practical activity.
try these questions from the text Qs 29 - 32