Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

BONUS EXPERIMENT:

UV through glass

When it’s dark, open the window, hold a bead in

front of the window pane, and shine the UV lamp

on it from the other side of the glass. Keep

checking for the blue color with the flashlight. You

will see that it turns color almost as quickly as

without the glass. So the UV light emitted by the

lamp penetrates the glass pretty well.

EXPERIMENT 12

Invisible Light

Under water

Do you think UV light can also penetrate water?

YOU WILL NEED

› UV lamp

› Large measuring cup

› Bead

› Metal paper clip

› Watch

› Flashlight

HERE’S HOW

1. Thread a bead onto the paper clip. This will

keep the bead from floating.

2. Fill the measuring cup with water and drop

the bead and paper clip into it. Make sure

they sink to the bottom.

3. Shine the UV lamp into the water from above.

Switch off the light every once in a while to

check if the bead has turned color.

4. Repeat the experiment without water, but

keeping the distance between the UV lamp

and the bead the same. Compare the amount

of time that the bead takes to turn blue.

Record your findings in this table:

WHAT’S HAPPENING

The bead changes color in about the

same amount of time both with or

without water. The layer of water lets

the UV light through, in other words. In

fact, even half a meter of water will

only reduce the UV light by about a

quarter. Now you understand why it’s

so important to protect yourself with

waterproof sunscreen even when

you’re swimming in the water.

Bead... Time (in seconds)

...under water

...without water

1 3

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