The sound wave with highest frequency is represented by

Options

A.
B.
C.
D.

Answer

To solve the question about which sound wave has the highest frequency, we need to understand the concept of frequency in sound waves.

### Step-by-Step Solution:

1. **Understanding Frequency**: Frequency is defined as the number of oscillations or cycles that occur in a unit of time, typically measured in Hertz (Hz). Higher frequencies correspond to higher pitches in sound.

2. **Identifying the Options**: The question mentions options like "2nd," "3rd," "4th," etc. These likely refer to harmonic frequencies or overtones of a fundamental frequency.

3. **Fundamental Frequency**: The fundamental frequency is the lowest frequency of a sound wave. The first harmonic (or fundamental) is the base frequency.

4. **Harmonics and Overtones**:
- The second harmonic (2nd) has a frequency that is twice that of the fundamental frequency.
- The third harmonic (3rd) has a frequency that is three times that of the fundamental frequency.
- The fourth harmonic (4th) has a frequency that is four times that of the fundamental frequency.

5. **Comparing Frequencies**: As we move to higher harmonics (2nd, 3rd, 4th, etc.), the frequency increases. Therefore, the harmonic with the highest number will have the highest frequency.

6. **Conclusion**: Among the options given, the sound wave represented by the highest frequency would be the one with the highest harmonic number mentioned in the options.

### Final Answer:
The sound wave with the highest frequency is represented by the option with the highest harmonic number (e.g., if "4th" is the highest option, then the answer is "4th").