How Sounds Are Made and Travel
How Sounds Are Made and Travel
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How Sounds Are Made and Travel
What do you already know about how we hear sounds?
Learning Objective
At the end of the lesson you will be able to describe how sound is produced by vibrating sources and explain the longitudinal nature of sound waves.
How Is Sound Produced?
Sound is made when something vibrates. The vibrations cause air molecules to move, creating sound waves that travel to our ears.
Demonstration: Feeling Vibrations
Hold your fingers gently on your throat and hum a note. What do you feel? The buzzing is the vibration making sound.
Properties of Sound Waves
Transverse Waves
In sound waves, particles move backwards and forwards, creating areas of compression and rarefaction.
In transverse waves, particles move up and down. Sound waves are NOT transverse, but longitudinal.
Longitudinal Waves
Visualising Sound
Look at these diagrams: a slinky moving like a sound wave (longitudinal) compared to a rope moving up and down (transverse).
Activity: Create a Sound Wave
Line up with classmates and make a human wave: lean forward and backward to show how sound travels as a longitudinal wave!
Check Your Understanding
Describe how sound is produced. What makes the sound wave longitudinal? Discuss with a partner or write your answer.
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
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