Acoustic Soundproofing Decibel Dampening Barrier Lab

45 mins Ages 7-9 Indoor

An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 7 to 9.

Materials Needed

  • • Cardboard shoebox with lid (1 unit)
  • • Audio source (phone playing tone or ticking clock) (1 unit)
  • • Smartphone with a free Decibel Meter app (1 unit)
  • • Dampening materials (sponge foam, wool cloth, bubble wrap) (assorted scraps)

Pro Tips

  • → Place an audio source (a smartphone playing static or a ticking clock) inside a shoebox.
  • → Measure the escaping sound with a free decibel meter app on another phone held 1 foot away.
  • → Line the box with different materials (dense wool, open-cell foam, bubble wrap) to compare which absorbs sound energy most effectively.

Safety First

Keep audio playback volumes at comfortable listening levels.

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Step-by-Step Instructions

1

Step 1

Place an audio source playing a steady tone inside an empty shoebox, put the lid on, and measure sound with a decibel app 30 cm away.

2

Step 2

Line the box walls with open-cell foam sponges, close the lid, and log the new decibel reading.

3

Step 3

Swap the foam for thick wool fabric and bubble wrap, recording decibel drops for each material.

4

Step 4

Compare your results on a chart to identify which material provides the best acoustic dampening.

What they are learning

Acoustic absorption and transmission loss Porous sound dampening mechanics Controlled decibel measurement comparisons