Parabolic Sound Mirror Whisper Collector Discs

45 mins Ages 7-9 Outdoor

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

Materials Needed

  • • Curved plastic snow saucers or large parabolic bowls (2 units)
  • • Long tape measure or pre-measured rope (20 meters) (1 unit)
  • • Open outdoor park or quiet lawn (1 space)

Pro Tips

  • → Set two curved plastic sleds or round snow saucers facing each other 20 meters apart in a quiet park.
  • → Locate the focal point of each dish: speak softly toward the dish center from this point.
  • → Sound waves bounce off the curve in parallel lines and refocus at the opposite dish, making whispers audible across long distances.

Safety First

Ensure field is safe and free of trip hazards; do not yell loudly into the focal point.

How was this activity?

Your anonymous feedback helps us recommend better activities.

Step-by-Step Instructions

1

Step 1

Set up two curved plastic round saucers or sleds facing each other across a 20-meter open lawn.

2

Step 2

Find the focal point by clicking your fingers in front of the dish until you hear a sharp, amplified acoustic return.

3

Step 3

Have your child place their ear at the focal point of Dish A while you whisper toward the center of Dish B.

4

Step 4

Whisper back and forth, observing how the parabolic curves carry soft voices across the field without shouting.

What they are learning

Parabolic acoustic ray reflection and focusing Acoustic focal point alignment Audio signal amplification without electronics