Which one of the following statements is wrong?

Options

A. Sound travels in straight line
B. Sound travels as waves
C. Sound is a form of energy
D. travels faster in vacuum than in air

Explanation

To determine which statement is wrong, let's analyze each option provided in the question:

1. **Sound travels in straight line.**
- This statement is generally true in a uniform medium. However, sound can bend or change direction when it encounters different mediums or obstacles, but in a simple context, it can be considered true.

2. **Sound travels as waves.**
- This statement is true. Sound is a mechanical wave that propagates through a medium (solid, liquid, or gas).

3. **Sound is a form of energy.**
- This statement is also true. Sound is indeed a form of energy that can be transferred through vibrations.

4. **Sound travels faster in vacuum than in air.**
- This statement is false. Sound requires a medium to travel and cannot propagate in a vacuum. In fact, sound travels faster in solids and liquids than in gases, and it does not travel at all in a vacuum.

Now, we can conclude that the wrong statement is:

**Sound travels faster in vacuum than in air.**

### Step-by-Step Solution:
1. **Identify the statements provided.**
- List the statements: Sound travels in straight line, Sound travels as waves, Sound is a form of energy, Sound travels faster in vacuum than in air.

2. **Analyze each statement for accuracy.**
- Check if sound travels in straight lines: Generally true.
- Check if sound travels as waves: True.
- Check if sound is a form of energy: True.
- Check if sound travels faster in vacuum than in air: False.

3. **Determine which statement is incorrect.**
- The statement "Sound travels faster in vacuum than in air" is incorrect because sound cannot travel in a vacuum.

4. **Conclude the answer.**
- The wrong statement is: "Sound travels faster in vacuum than in air."