Which of the following statements about electromagnetic waves sound waves and water waves is/are correct?
1. They exhibit reflection
2 They carry energy
3. They exert pressure
4. They can travel in vacuum
Select the correct answer using the code given below:

Options

A. Sound wave require medium to propagate
B. Sound wave is an electromagnetic wave
C. Sound wave do not require any medium to propagate
D. Both (2) and (3)

Answer

To determine which statements about electromagnetic waves, sound waves, and water waves are correct, we will analyze each statement one by one.

1. **They exhibit reflection**:
- All types of waves, including electromagnetic waves (like light), sound waves, and water waves, can exhibit reflection. When a wave encounters a barrier, it can bounce back into the original medium. For example, light reflects off mirrors, sound reflects off walls, and water waves reflect off the edges of a pool.
- **Conclusion**: This statement is **correct**.

2. **They carry energy**:
- Waves are disturbances that transfer energy from one location to another. Electromagnetic waves carry energy in the form of electromagnetic radiation (like light), sound waves carry energy through vibrations in the medium, and water waves carry energy across the surface of the water.
- **Conclusion**: This statement is **correct**.

3. **They exert pressure**:
- Waves can exert pressure on surfaces they encounter. For example, sound waves create pressure variations in the air, and electromagnetic waves can exert radiation pressure when they strike a surface. Water waves can also exert pressure on objects floating on their surface due to the force of the moving water.
- **Conclusion**: This statement is **correct**.

4. **They can travel in vacuum**:
- Electromagnetic waves can travel through a vacuum (they do not require a medium), while sound waves cannot travel in a vacuum since they require a medium (like air, water, or solid materials) to propagate. Water waves also require a medium (water) to exist and cannot travel in a vacuum.
- **Conclusion**: This statement is **incorrect**.

Now, summarizing the results:
- Statement 1: Correct
- Statement 2: Correct
- Statement 3: Correct
- Statement 4: Incorrect

Thus, the correct answer is that statements 1, 2, and 3 are correct.

### Final Answer:
The correct statements are 1, 2, and 3.