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प्रश्न
How is light scattered by the air?
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उत्तर
Scattering is the phenomenon of change in the direction of light rays when they travel through Earth's atmosphere. Air is a mixture of gases, smoke, dust and very fine particles. As the rays of light fall on these particles, these rays are spread/scattered in all directions. It is a natural phenomenon which is observed on a daily basis.
संबंधित प्रश्न
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. | (a) Oxygen |
| 2. A gas used for filling weather observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Name the processes which maintain the balance between oxygen and carbon dioxide in the air. How is it done?
Define rusting?
How is air useful to windmills?
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
Describe a simple experiment with the help of a diagram to show that Air occupies space
What will happen if the amount of water vapour in the air increases.
Explain Lavoisier’s experiment which provided evidence to the discovery of components in air.
Explain the term ‘air pollution’, with reference to air quality. State the sources of a few main pollutants.
