Advertisements
Advertisements
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 ?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Give reasons:
Solids cannot be compressed.
Write whether the following statement is true or false.
Solids have the largest inter-molecular space.
Write true or false for statement. Rewrite the false statement correctly.
Solids can be compressed easily.
Name the three states of matter and define them.
Fill in the blank.
Water is a matter because it has mass and occupies _______
Which one of the following statements is not true?
- the molecules in a solid vibrate about a fixed position
- the molecules in a liquid are arranged in a regular pattern
- the molecules in a gas exert negligibly small forces on each other, except during collisions
- the molecules of a gas occupy all the space available
State in which of the following examples ie. a piece of wood, water, light gas is the Inter-particle space maximum.
State in which of the following examples ie. a piece of wood, water, light gas is the Inter-particle attraction maximum.
Match the following.
| Property | Example |
| Breaks easily (Brittle) | Metal pan |
| Bends readily | Rubber band |
| Can be stretched easily | Cotton wool |
| Gets compressed easily | Mud pot |
| Gets heated readily | Plastic wire |
The property to flow is unique to fluids. Which one of the following statements is correct?
