Sound travels with a different speed in different · media.· In what order does the velocity of sound increase in these media ?

Options

A. Water, iron and air
B. Iron, air and water
C. Air, water and iron
D. Iron, water and air

Explanation

To determine the order of increasing velocity of sound in different media, we need to analyze how sound travels through solids, liquids, and gases.

### Step-by-Step Solution:

1. **Understanding the Media**:
- Sound travels through different media: solids, liquids, and gases. The arrangement and closeness of particles in these media affect how sound waves propagate.

2. **Speed of Sound in Solids**:
- In solids, particles are closely packed together. This close proximity allows sound waves to transfer energy quickly from one particle to another, resulting in a high speed of sound.

3. **Speed of Sound in Liquids**:
- In liquids, particles are also close together, but not as tightly packed as in solids. Therefore, sound travels faster in liquids than in gases but slower than in solids.

4. **Speed of Sound in Gases**:
- In gases, particles are much farther apart compared to solids and liquids. This distance means that sound waves take longer to transfer energy between particles, resulting in the slowest speed of sound in gases.

5. **Order of Increasing Velocity**:
- Based on the analysis above, we can arrange the media in order of increasing speed of sound:
- **Gases (e.g., Air)**: Slowest speed
- **Liquids (e.g., Water)**: Intermediate speed
- **Solids (e.g., Iron)**: Fastest speed

### Final Order:
- Gases < Liquids < Solids