Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 9

WHAT’S HAPPENING

The experiment shows that there’s also

some UV light in the shade. In fact, it is

even possible to tan in the shade, even

though it takes longer than in full

sunshine. Of course, when the sun is

low in the morning or evening, and

especially when the sky is heavily

overcast with clouds, the UV

radiation is much less intense.

UV from the sky

As the last experiment showed, the beads work

well as indicators for UV light. It is well known

that sunlight includes a portion of UV light. But

can you also be exposed to any UV light if you

sit in the shade or when the sky is cloudy? See

for yourself!

YOU WILL NEED

› Beads

› Petri dish

› Watch

› Pen

HERE’S HOW

1. Place the white beads in the Petri dish again

and take them outside while keeping the dish

covered with your hand. Find a place in the

shade, not in the direct sun.

2. Take your hand away and count the number

of seconds before the colors appear. Compare

how long it takes depending on whether the

sky is clear or overcast. See if the time of day

has any influence. Record your findings in

this table:

Type of light Time (in seconds)

Shade

Sunlight, clear sky

Slightly overcast sky

Very overcast sky

Morning

Midday

Evening

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