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| Question | Answer |
| Module 5.4 Light Energy | By: Rahma Salih Abdelgadir aka Sasha! |
|
What is the speed of light?
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300 million meters per second! |
| What is the difference between how can light travel and how sound can travel? | Light: Doesn't need material to travel though. Sound: Sound must have something to travel though. |
| What is electromagnetic radiation? | Radiant energy released by stars. |
|
List 4 radiation from the sun.
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1. Radio waves 2. X-ways 3. Microwaves 4. UV radiation |
| What is electromagnetic spectrum? | The range of all forms of electromagnetic radiation. |
| What is the difference between the waves of the electromagnetic spectrum? | Their ONLY difference is in their wavelength and frequency. |
| What is dispersion? | The splitting of white light into colours of the rainbow. |
| What is the visible spectrum? | The band of colours produced from the splitting of white light. |
| What is the order of of colours within the visible spectrum? | 1. Red 2. Orange 3. Yellow 4. Green 5. Blue 6. Indigo 7. Violet aka ROY G BIV |
| What happens when you move though the spectrum towards the end? | Wavelength of light decreases and frequency increases. |
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What happens to light energy when it hits a surface ?
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1-Transmitted though the substance 2-Reflected from the surface 3-Absorbed into the substance |
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What is reflection?
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The change in direction of a wave that bounces off a surface. |
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What is an image?
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Figure of an object produced by reflected light or refracted rays of light. |
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What are plane mirrors?
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Mirrors that are flat. |
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What is a convex mirror?
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A mirror that curves outwards. |
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What is a concave mirror?
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Mirror that caves inwards. |
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What is refraction?
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The bending of light as it enters or leaves a material. |
| What is convex lens? | Lens that curves outwards. |
| What is concave lens? | Lens that curve inwards. |
| What is short-sightedness or myopia? | The lack to see things clearly unless they are some-what close to the eyes. |
| What is long-sightedness or hyperopia? | Incapable to see things clearly, especially if they are relatively close to the eyes. |
| What are glasses or contact lens used for? | Adjust the focus of your eyes back to the correct position. |
| What are concave lens used for? | Used to treat short-sightedness. |
| What are convex lens used for? | Used to treat long-sightedness. |
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