Through which of the following mediums sound CANNOT travel?
Vacuum
Understanding Sound Propagation: Why a Medium is Essential
Sound is a type of wave known as a mechanical wave. Mechanical waves require a medium to travel through. This medium can be a solid, a liquid, or a gas. Sound travels by causing the particles of the medium to vibrate. These vibrations are then passed from one particle to the next, allowing the sound energy to propagate.
Analyzing the Options for Sound Travel
Let's look at the given options and determine if they can act as a medium for sound:
- Vacuum: A vacuum is a space that is essentially empty of matter. Since sound needs particles to vibrate and transmit energy, it cannot travel through a vacuum where there are no particles. This is why you wouldn't hear sounds in outer space directly, as space is largely a vacuum.
- Milk: Milk is a liquid. Liquids have particles that are close enough to transmit vibrations. Therefore, sound can travel through milk.
- Air: Air is a mixture of gases. Gases have particles, although they are much further apart than in solids or liquids. Sound travels through air by causing air molecules to vibrate. This is how we normally hear sounds around us.
- Steel: Steel is a solid. Solids have particles that are very close together and are strongly bonded. This allows vibrations to be transmitted very efficiently. Sound generally travels fastest through solids. Therefore, sound can travel through steel.
Conclusion: The Medium Sound Cannot Travel Through
Based on the nature of sound waves requiring a medium, we can conclude that sound cannot travel through a vacuum because it lacks the necessary particles for transmission.
Therefore, the medium through which sound CANNOT travel is a vacuum.
Speed of Sound in Different Mediums
The speed at which sound travels varies depending on the medium and its properties (like density and elasticity). Here's a general comparison:
| Medium Type | Particle Arrangement | Speed of Sound (General) |
|---|---|---|
| Solid | Particles are close together and tightly packed. | Fastest |
| Liquid | Particles are closer than gases, but less organized than solids. | Faster than gases, slower than solids. |
| Gas | Particles are far apart and move freely. | Slowest |
| Vacuum | Essentially no particles. | Cannot travel (Speed = 0) |
Revision Table: Sound and Mediums
| Concept | Explanation |
|---|---|
| What is Sound? | A mechanical wave requiring a medium. |
| Why a Medium is Needed? | Sound travels by vibrating particles in the medium. |
| Mediums for Sound Travel | Solids, Liquids, Gases. |
| Mediums Sound Cannot Travel Through | Vacuum (lack of particles). |
Additional Information: Sound in Space
Popular science fiction often depicts explosions and sounds in space. However, this is scientifically inaccurate. Since space is largely a vacuum, there is no medium for sound to travel, so any explosions or sounds would be silent to a listener nearby (unless transmitted via radio waves, which are electromagnetic waves and do not require a medium).
Understanding that sound is a mechanical wave is key to knowing why a vacuum prevents its travel.
Important Questions from Wave
Which one of the following waves are used by the common TV remote control?
Which of the following objects is visible only due to reflected light?
Which of the following statements about sound is FALSE?
Which of the following is NOT a medium for a mechanical wave, that is sound, to travel?
To produce sound waves of different pitch, objects of different sizes and conditions are made to vibrate at different-
