Science activity
Sound and Light Lab
Explore sounds and light through play. Make loud and soft sounds, discover what makes sounds, and play with shadows.
Materials and setup
- cups and string
- rubber bands
- flashlight
- mirrors
- prism or glass of water
- box
How this changes by age
Pre-K (ages 3–4)
Explore sounds and light through play. Make loud and soft sounds, discover what makes sounds, and play with shadows.
Steps
- Make different sounds: clap, stomp, whisper, shout. Which is loud? Soft?
- Touch your throat while humming. Feel the vibrations! Sound comes from vibrations.
- Make instruments: shake a container of rice, tap a pot with a spoon, strum rubber bands on a box.
- Go outside and make shadows with your body. Can you make your shadow bigger? Smaller?
- Shine a flashlight and block it with your hand. What happens to the light?
- Tell a grown-up one thing that surprised you.
Learning objectives
- Distinguish between loud and soft sounds
- Discover that sounds are made by vibrations
- Observe how light creates shadows
Kindergarten (ages 5–6)
Investigate how sound travels and how light behaves. Make a string telephone, test which materials light passes through, and explore colors.
Steps
- Make a string telephone: connect two cups with string. Talk into one cup. Can the other person hear?
- Test sound travel: put your ear to a table while someone taps the other end. Sound travels through solids!
- Sort objects: transparent (light goes through), translucent (some light), opaque (no light passes).
- Use a prism or water glass in sunlight to make a rainbow. White light is made of all colors!
- Create shadow puppets and perform a short show.
- Tell a grown-up one thing that surprised you.
Learning objectives
- Demonstrate that sound travels through different materials
- Classify materials as transparent, translucent, or opaque
- Observe that white light contains all colors of the spectrum
Early elementary (ages 6–8)
Study the science of sound waves and light: pitch, volume, reflection, refraction, and the electromagnetic spectrum basics.
Steps
- Experiment with pitch: stretch rubber bands of different thicknesses over a box. Which makes a higher pitch? Why?
- Measure volume: how does distance affect how loud a sound seems? Test at 3 distances.
- Explore reflection: shine a flashlight at a mirror. Can you redirect light to hit a target on the wall?
- Explore refraction: put a pencil in a glass of water. Why does it look bent? Draw what you see.
- Build a simple periscope using 2 small mirrors and a milk carton. Explain how it works.
- Create a diagram showing how sound waves and light waves are similar and different.
- In one sentence, tell a parent or sibling what surprised you today.
Learning objectives
- Explain how pitch and volume relate to sound wave properties
- Demonstrate reflection and refraction of light
- Compare and contrast sound waves and light waves
Upper elementary (ages 8–10)
Investigate wave properties: wavelength, frequency, amplitude. Study the electromagnetic spectrum, sound engineering, and optical phenomena.
Steps
- Model wave properties with a Slinky or rope: demonstrate wavelength, frequency, and amplitude. How does changing each affect the wave?
- Research the electromagnetic spectrum: radio, microwave, infrared, visible, UV, X-ray, gamma. Create a scale diagram.
- Sound engineering experiment: test how different materials absorb or reflect sound. Rate each on a scale of 1-5 for soundproofing.
- Investigate optical illusions: research 3 illusions and explain the science behind why they fool our brains.
- Calculate the speed of sound: measure the delay between seeing lightning and hearing thunder to estimate distance.
- Design an experiment to answer a question about sound or light. Write a hypothesis, procedure, and results.
- In one sentence, tell a parent or sibling what surprised you today.
Learning objectives
- Describe wave properties: wavelength, frequency, and amplitude
- Explain the electromagnetic spectrum and its applications
- Design and conduct experiments about sound and light phenomena
Safety and evidence note
Read the full activity before beginning. An adult should supervise tools, heat, food, outdoor work, movement, and experiments as appropriate. Completion records that the activity was done; the child’s explanation, work sample, photo, or demonstration is stronger evidence of learning than a completion check alone.
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