1Cut out the Word Square on Sheet 3 and Stick It Into Your Book

HELP

1Cut out the word square on sheet 3 and stick it into your book.

The answer to each of these questions can be found in the word square. Circle the answers in the square.

aThe colours of light make up a .

bSplitting white light into its colours is called .

cWe can use this object to split light into its colours.

dWhen white light goes through a red filter, the colour that comes through is .

eLight which does not come through a coloured filter is

fThere are colours in white light.

2Copy and complete the sentence below.

The light coming into a building through stained glass windows is coloured because …

CORE

3Ellie is an actress. She is wearing a coloured top on stage. It has squares coloured blue, red and green.

aWhat colours will Ellie see on her top if she is standing in white light?

bWhat colours will she see if she is standing in light from a green light and a red light at the same time?

cWhat colours will she see if she is only standing in a blue light?

dEllie is lit by a single spotlight. It has a blue filter and a green filter in front of the lamp.

iWhich coloured light will actually be shining on Ellie?

iiWhat colour will Ellie’s top appear to the audience?

This worksheet may have been altered from the original on the CD-ROM.

EXTENSION

4Chlorophyll gives leaves their green colour. It is an important part of photosynthesis. Gilly did some photosynthesis experiments with different coloured lights.

She obtained the different colours by putting filters between some pondweed, in a beaker of water, and a white light. She counted the number of bubbles of oxygen that the pondweed produced every minute. This table shows Gilly’s results.

Colour of light used / Number of bubbles per minute
White / 37
Red / 24
Green / 0
Blue / 34

aExplain why the number of bubbles produced in green light is zero.

bWhy does white light give the most bubbles?

cWhich single colour can plants use most successfully?

dGilly noticed that the pondweed beaker became quite warm, on the side nearest to the lamp.

iWhy is this a problem?

iiWhat could Gilly do to solve the problem?

eGilly was not very careful about where she put the lamp butit was always between 0.25 and 0.5 metres from the beaker.

Explain why this might be a different problem from thewarming.

5When white light is dispersed by a prism a spectrum is obtainedon a screen. Jim passes a beam of pure blue light through aprism.

aDescribe what Jim would see on the screen.

bExplain your answer.

This worksheet may have been altered from the original on the CD-ROM.

HELP

Wordsearch

This worksheet may have been altered from the original on the CD-ROM.

HELP

Wordsearch

This worksheet may have been altered from the original on the CD-ROM.