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Mindmap: Light | Science Class 7

The document Mindmap: Light | Science Class 7 is a part of the Class 7 Course Science Class 7.
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FAQs on Mindmap: Light - Science Class 7

1. What is light and how does it travel?
Ans.Light is an electromagnetic wave that travels through space. It can move through a vacuum at a speed of approximately 299,792 kilometers per second (about 186,282 miles per second). Light travels in straight lines and can be reflected, refracted, and absorbed by different materials.
2. What are the different types of light?
Ans.Light can be categorized into several types, including visible light, ultraviolet light, infrared light, and other forms of electromagnetic radiation such as X-rays and radio waves. Visible light is the portion of the spectrum that can be seen by the human eye, while ultraviolet and infrared light are types of radiation that are invisible to us.
3. How does light interact with matter?
Ans.Light interacts with matter through processes such as reflection, refraction, diffraction, and absorption. Reflection occurs when light bounces off a surface, refraction is the bending of light as it passes through different media, diffraction is the spreading of light waves around obstacles, and absorption happens when materials take in light energy.
4. What is the importance of light in our daily lives?
Ans.Light is essential for various aspects of life, including vision, photosynthesis in plants, and the functioning of many technologies such as cameras, lasers, and solar panels. It also affects our mood and circadian rhythms, highlighting its importance beyond just visibility.
5. How do scientists measure light?
Ans.Scientists measure light using various units and instruments. The most common unit is the lumen, which measures the total amount of visible light emitted. Instruments like photometers and spectrometers are used to measure light intensity and its spectral composition, respectively, allowing for detailed analysis of light properties.
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