Information about Red car goes black experiment with Fizzics Education | Kids Science Experiments

# Red car goes black?

Follow FizzicsEd 150 Science Experiments:

You will need:

A strong torch

A strong rubber band

Green cellophane

One red object. We used a red toy car. But you can use a tomato.

A very dark room

1

Place the green cellophane over the torch and secure it with a rubber band.

Darken the room and shine the green light on the red object.

2

What colour do you see?

3

Try different coloured objects and lights. Is the effect always the same?

This science experiment works very well if you have access to a green spotlight.

### What is going on?

White light is comprised of all of the colours of the rainbow i.e. the light spectrum – visible light ranges in frequency from VIOLET (400nm) to RED (700nm).

Different materials absorb and reflect the different colours of light. The different colours represent different wavelengths of light. A red object is only ‘red’ when you see the red wavelength of light being reflected off it. So a red car reflects red light, while the other light wavelengths get absorbed. The green light from your torch does not have a red wavelength in it. Because the red car absorbs the green light, no light is reflected and you are left seeing a black car.