The waves surround us, surround us, manage us, help us, seduce us, speak to us.
The waves are present in our lives from before birth, from the womb, and accompany us in our games, our dreams, our studies, our trips.
The wave nature of light, sound waves, pressure waves … Endless alternatives to discover the undulating world in which we live.

In order to unravel these sinuous mysteries, in our School for Little Scientists Espiciencia, children from 4 to 16 years old, we have carried out different low cost activities to make them visible.:
1.- Sound waves:
• Let’s have the resonance frequencies of PVC pipes and cardboard.
• We manage to make sound by applying heat by expansion and formation of currents due to temperature difference, inside a test tube with steel wool.
• We levitate porespan balls with ultrasound.
• We produced sound in an electric arc.
• We build monochords like Pythagoras’ and other stringed instruments with recycled materials.
• We observe sound thanks to a membrane made with a globe and a laser pointer.
• We do research on the transmission of sound by making telephones.

2.- Light as a wave:
• We made a device that produced waves to reproduce the double slit experiment.
• We designed a wave display with a bow, skewer sticks, and nuts.
• We use microwaves to synthesize rubies from aluminum and chromium oxides, thanks to the plasma that was formed inside them.
• We calculate the speed of light thanks to an approximation with a wet cardboard and a microwave.
• We play with colors to discover the visible spectrum.
• We became Herschel to experiment with infrared with a prism and some thermometers.
• We extracted quinine and chlorophyll to observe their absorption in the ultraviolet.
• We inquired whether the reading of our infrared thermometers was influenced by the fabrics of our clothing.
• We observe the polarization of light and its interference with sunglasses lenses.

We continue to investigate new experiences for our collection of the wave world and be able to show them in the next Science fairs: VII Science and Technology Fair of Castilla y León (Burgos, Spain) and XXII Science in Action (Murcia, Spain).
A hug and HEALTH.

All visuals belong to the Author – Attribution CC-BY