Is white not white? Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Is white not white? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

In experience"Mix colors"you got the white color by adding multi-colored sectors. In "Aquarium in the dark"All the colors of the rainbow came out of white. But since all this is so, then the white color is not white at all, or rather, it is not simple, but composite? Maybe that's why a rainbow is obtained in the shroud of rain and in the splashes of the fountain, iridescent stains in a film of kerosene or gasoline on the surface of a puddle?

Yes it is. The sun sends us light in which all the rays are mixed: red, green, and purple. This light appears white to us. But look: here he fell on a sheet of paper and on a sheet of wood. Why is one leaf white and the other green? Because paper reflects all the rays, and the same mixture of all colors gets into our eyes. And the greenery of plants best reflects the green rays. The rest are absorbed. If you come across red glass, even from a photographic lantern or from a car brake light, look through it at the grass and trees. They appear very dark, almost black!

This means that very few red rays are really reflected from them! And colored glasses, why do they seem colored? Because from all the motley solar mixture they "choose", not all the rays pass through. If you have at least 6x6 cm colored glass plates, you can make a fun experiment with colorful stars.

Take a sheet of cardboard, cut it slightly and bend it at an angle. On each sash, draw a circle with a radius of 3 cm so that when the sheet is folded in half, the centers of the circles coincide. In each circle, draw a four-pointed star. Only one star should have two vertical and two horizontal beams, and the other must have all the beams rotated by 45 °. This is clearly seen in our figure.

Carefully cut out the stars along the contour and place the cardboard on the table between the screen - a sheet of white paper - and two candles or two table lamps. These candles or lamps must necessarily be of the same height.

Is white not white?

Adjust the angle between the cardboard flaps so that the bright stars on the screen lie one on top of the other and get one eight-pointed star. Now cover one of the lamps with colored glass. If you can’t find any colored glass, you can take a simple one and smear it with Vaseline, slightly tinted with colored ink.

Look, the star on the screen has become tricolor! The middle is white, some rays are colored in the color of glass, and others - in addition to it! If, say, the glass is red, the teeth will be red and green, if blue - blue and orange, if purple - lilac and yellow!

Author: Galpershtein L.Ya.

We recommend interesting experiments in physics:

▪ Fountain in a bottle

▪ Soap bubble flies

▪ Aquarium in the dark

We recommend interesting experiments in chemistry:

▪ Let's silver the mirror

▪ Inhibitors are substances that slow down a chemical reaction.

▪ Drilling holes with electric current

See other articles Section Entertaining experiences at home.

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