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What is light? | Year 3 Science PDF Download
Where light comes from
- Importance of Light: Light is essential for our vision. It emanates from various sources like the Sun, stars, torches, lamps, and candles. Certain light sources possess such intensity that direct exposure can harm our eyes, necessitating the use of sunglasses.
- Propagation of Light: Light, the fastest traveler in the universe, always moves in straight lines.
- Animal Light Sources: Some creatures like fireflies and glow worms are natural sources of light. Fireflies, for instance, produce light through a chemical reaction within their bodies.
- Chemical Reactions in Nature: Chemical reactions are transformations where substances interact to form new compounds. For instance, the chemical reactions in baking cakes or bread result in the creation of a different substance.
Question for What is light?Try yourself: Which of the following is a natural source of light?View Solution
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FAQs on What is light? - Year 3 Science
| 1. Where does light come from? |  |
Ans. Light primarily comes from sources such as the sun, stars, light bulbs, and other artificial lighting sources.
| 2. How is light produced by the sun? | |
Ans. The sun produces light through a process called nuclear fusion, where hydrogen atoms combine to form helium, releasing energy in the form of light and heat.
| 3. What are the properties of light? | |
Ans. Light is a form of electromagnetic radiation that travels in waves and behaves both as a particle and a wave. It can be reflected, refracted, absorbed, or transmitted.
| 4. How does light travel through space? | |
Ans. Light travels in straight lines at a speed of approximately 186,282 miles per second in a vacuum. It can also be affected by gravity, bending around massive objects like stars.
| 5. How is light used in everyday life? | |
Ans. Light is used in various ways in everyday life, such as providing illumination through light bulbs, enabling communication through fiber optics, and enabling vision through the eyes.
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Dec 04, 2024 Last updated |
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