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Why is the Sky Blue? Video Lecture | Crash Course: Class 10
FAQs on Why is the Sky Blue? Video Lecture - Crash Course: Class 10
| 1. Why does the sky appear blue during the day? |  |
Ans.The sky appears blue during the day due to a phenomenon called Rayleigh scattering. When sunlight enters the Earth's atmosphere, it collides with air molecules and scatters in all directions. Blue light has a shorter wavelength compared to other colors, so it is scattered more, making the sky look blue to our eyes.
| 2. Does the color of the sky change at sunset? | |
Ans.Yes, the color of the sky changes at sunset due to the angle of the sun's rays. During sunset, sunlight has to pass through more of the Earth's atmosphere. This causes the shorter blue wavelengths to scatter out, allowing longer wavelengths like red and orange to dominate, resulting in beautiful sunset colors.
| 3. Why is the sky sometimes gray? | |
Ans.The sky appears gray when there are many clouds in the atmosphere. Clouds are made of tiny water droplets or ice crystals that scatter all colors of light equally. This scattering prevents the sunlight from reaching the ground directly, giving the sky a gray appearance.
| 4. Does pollution affect the color of the sky? | |
Ans.Yes, pollution can affect the color of the sky. Particles and gases released into the atmosphere from vehicles and industries can scatter light differently. This may lead to a hazier sky and changes in color, often resulting in more vibrant sunsets or a dull gray appearance during the day.
| 5. What causes a blue sky on a clear day? | |
Ans.A blue sky on a clear day is caused by the scattering of sunlight by the Earth's atmosphere. The shorter blue wavelengths are scattered more than other colors, making the sky predominantly blue. This effect is most noticeable when there are few clouds and low levels of pollution.
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