NEET  >  Scattering of Light:Why is the Sky Blue?

# Scattering of Light:Why is the Sky Blue? Video Lecture - Physics Class 12 - NEET

## Physics Class 12

154 videos|444 docs|185 tests

## FAQs on Scattering of Light:Why is the Sky Blue? Video Lecture - Physics Class 12 - NEET

 1. Why is the sky blue?
Ans. The sky appears blue due to a phenomenon called Rayleigh scattering. When sunlight enters the Earth's atmosphere, its shorter blue wavelengths are scattered more by the molecules in the air compared to the longer red wavelengths. As a result, we see a blue color when we look at the sky.
 2. Does the color of the sky change at different times of the day?
Ans. Yes, the color of the sky can change at different times of the day. During sunrise and sunset, the path length of sunlight through the atmosphere is longer, causing more scattering of the shorter blue and green wavelengths. This results in a redder appearance of the sky during these times.
 3. Why does the sky sometimes appear white or gray?
Ans. The sky can appear white or gray when it is cloudy or overcast. Clouds are made up of tiny water droplets or ice crystals that can scatter all wavelengths of light equally. This scattering of light in all directions gives the sky a white or gray appearance when clouds cover a large portion of it.
 4. Can the presence of pollutants affect the color of the sky?
Ans. Yes, the presence of pollutants in the atmosphere can affect the color of the sky. Air pollution, such as smoke or haze, can scatter and absorb sunlight, leading to a change in the color of the sky. It can make the sky appear hazy, yellowish, or even brownish, depending on the concentration and composition of the pollutants.
 5. Why does the sky appear darker at higher altitudes?
Ans. The sky appears darker at higher altitudes because there is less atmosphere above to scatter sunlight. As we ascend to higher altitudes, the path length of sunlight through the atmosphere decreases, resulting in less scattering of light. This makes the sky appear darker and the stars more visible at higher altitudes.

## Physics Class 12

154 videos|444 docs|185 tests

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