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प्रश्न
When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.
- What could particles X be ?
- Name the gas (or mixture of gases) Y.
- What is the phenomenon exhibited by particles X known as ?
- What is causing the movement of particles X ?
- What conclusion does the existence of this phenomenon give us about the nature of matter ?
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उत्तर
- The particles, 'X' are dust particles.
- Gas 'Y' is Air.
- This phenomenon being exhibited by 'X' particles is called the Brownian motion.
- The fast moving air molecules are constantly hitting the tiny dust particles, causing them to move rapidly in a very haphazard manner.
- The gaseous matter ‘air’ is made up of tiny particles that are constantly moving.
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संबंधित प्रश्न
Fill in the blank:
The change of a solid into a liquid is called melting or................
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The temperature at which a liquid starts changing into its vapour state is ______.
What are fluids ? Give two examples.
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Match the columns.
| (1) iron and gold | (a) molecules are very far apart |
| (2) melting | (b) pure substance |
| (3) intermolecular space | (c) non - metals |
| (4) compound | (d) the space between the molecules |
| (5) gases | (e) change from solid to liquid |
| (f) metals |
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Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
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