When we say that a guitar produces sounds of frequency 25 Hz, it means that the guitar strings produce _______

Options

A. 25 vibrations in one second
B. one oscillation in 25 seconds
C. sounds of amplitude 25 metres
D. sounds with the help of a string of length 25 cm

Answer

To answer the question, "When we say that a guitar produces sounds of frequency 25 Hz, it means that the guitar strings produce _______," we need to understand what frequency means in the context of sound production.

### Step-by-Step Solution:

1. **Understanding Frequency**:
- Frequency is defined as the number of vibrations or oscillations that occur in one second. It is measured in Hertz (Hz).

2. **Given Frequency**:
- The problem states that the frequency is 25 Hz. This means that the guitar strings are vibrating 25 times in one second.

3. **Interpreting the Options**:
- We need to evaluate the options provided in the question:
- A) 25 vibrations in 1 second
- B) 1 oscillation in 25 seconds
- C) Sounds of amplitude of 25 meters
- D) Sounds with the help of a string of length 25 cm

4. **Analyzing Each Option**:
- **Option A**: 25 vibrations in 1 second - This matches our understanding of frequency (25 Hz).
- **Option B**: 1 oscillation in 25 seconds - This describes the time period, not frequency, and is incorrect.
- **Option C**: Sounds of amplitude of 25 meters - Amplitude is unrelated to frequency and is incorrect.
- **Option D**: Sounds with the help of a string of length 25 cm - The length of the string does not determine the frequency directly and is incorrect.

5. **Conclusion**:
- The correct answer is **A) 25 vibrations in 1 second**. This is the definition of frequency in this context.

### Final Answer:
When we say that a guitar produces sounds of frequency 25 Hz, it means that the guitar strings produce **25 vibrations in 1 second**.