iStarSign inScience 8 · Unit 6: Light · Cambridge Lower Secondary Science Stage 8
6.3 Making rainbows
17 questions · e.g. How do the colours appear on a white screen?
Questions
1. What is the range of colours in a rainbow called?
Check2. What is the correct order of the colours of the rainbow?
- red, orange, yellow, green, blue, indigo, violet
- green, blue, red, violet, orange, yellow, indigo
- red, yellow, orange, blue, green, violet, indigo
- violet, red, green, blue, yellow, orange, indigo
3. What colour of light must shine on a prism to get a full rainbow?
Check4. What is the splitting of white light into colours called?
Check5. How do the colours appear on a white screen?
- In circles.
- Separated by white spaces.
- Each colour merges into the next with no space.
- Separated by black spaces.
6. What is the triangular glass object that splits light?
Check7. Which colour is refracted the most by a prism?
Check8. Which colour is refracted the least by a prism?
Check9. Why do different colours refract by different amounts?
- They have different temperatures.
- Some colours are heavier.
- They travel at different speeds in the glass.
- They come from different sources.
10. How could you make the colours on the screen brighter?
Check11. How does a rainbow form in the sky?
- Raindrops refract and disperse sunlight.
- Clouds reflect light only.
- The Sun makes coloured rays.
- Wind mixes colours.
12. In plastic, violet light is refracted more than red. How do their speeds compare?
- Red stops.
- Violet travels faster.
- Violet travels more slowly than red in the plastic.
- They travel at the same speed.
13. Where must the Sun be for you to see a rainbow?
Check14. How many colours are in the visible spectrum?
Check15. Who showed in 1666 that white light can be split into different colours?
Check- Check
17. Why must the Sun be behind you to see a rainbow?
- The Sun's light would blind you.
- The water drops reflect the light back inside them.
- Rainbows only form in the shade.
- The Sun is too far away.