In which medium the speed of sound will be maximum ?

Question

Accepted Answer

The speed of sound is influenced by the medium through which it travels. The key factors affecting the speed of sound in a medium are the medium's density and elasticity. Generally, sound travels faster in solids than in liquids and gases because the molecules in solids are more closely packed, allowing sound waves to transmit more efficiently.

1. **Explanation for Option 3 (Steel):**
   - Steel is a solid with high density and excellent elasticity, which allows sound waves to travel through it very efficiently. The tightly packed molecules in steel facilitate rapid transmission of sound waves, resulting in a high speed of sound. Among the given options, steel provides the optimal combination of density and elasticity, making it the medium where the speed of sound is maximum.

2. **Explanation for why other options are incorrect:**
   - **Option 1 (Water):** Water is a liquid, and while sound travels faster in water than in air, it does not surpass the speed of sound in solids like steel. The molecular structure of water, being less dense and less elastic compared to solids, results in a slower speed of sound.
   - **Option 2 (Copper):** Copper is a solid and sound travels faster in copper than in liquids or gases. However, the speed of sound in copper is still lower than in steel due to differences in their elastic properties and density. Steel's specific combination of these properties allows sound to travel faster in it than in copper.
   - **Option 4 (Aluminium):** Aluminium, like copper, is a solid and supports a relatively high speed of sound. However, similar to copper, the speed of sound in aluminium is not as high as in steel. The specific physical properties of steel, including its density and elasticity, make it superior to aluminium in terms of sound transmission speed.

In conclusion, the speed of sound is maximum in steel due to its optimal physical properties, making Option 3 the correct answer.