Level 3: Vibrations

Waves, sound and light · level 3 of 8 · rough age 9-10 (a guide for parents; anyone can start anywhere)

This level looks inside a sound. You see how a vibration squashes and stretches the air, why sound cannot cross empty space, and how fast it travels, so you can time thunder and echoes. Then you measure pitch in hertz and loudness in decibels, and follow a sound into your ear.

Lesson	You will be able to
Sound is a vibration	Explain how a vibration makes a sound wave in air
Sound needs something to travel through	Explain why there is no sound in space
How fast sound travels	Use the speed of sound to time thunder and echoes
Pitch	Link pitch to frequency, measured in hertz
Loudness	Link loudness to the size of a vibration, and use decibels
Hearing	Follow a sound through the parts of the ear

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