Which of the following is NOT correct?

Options

A. More oscillation per second, higher time period
B. Greater amplitude greater loudness
C. Higher pitch, higher frequency of vibration
D. More the value of decibel, higher is the noise

Explanation

To determine which of the following statements is NOT correct regarding sound, we will analyze each option step by step.

### Step 1: Analyze Option 1
**Statement:** More oscillation per second means higher time period.

- **Understanding Frequency and Time Period:**
- Frequency (f) is defined as the number of oscillations (or cycles) per second.
- Time period (T) is the duration of one complete cycle of oscillation.
- The relationship between frequency and time period is given by the formula:
\[ T = \frac{1}{f} \]
- **Conclusion for Option 1:**
- If there are more oscillations per second (higher frequency), the time period must be lower, not higher. Therefore, this statement is incorrect.

### Step 2: Analyze Option 2
**Statement:** Greater amplitude means greater loudness.

- **Understanding Amplitude and Loudness:**
- Amplitude refers to the maximum displacement of particles in a wave from their rest position.
- Loudness is directly related to the amplitude of the sound wave; greater amplitude results in greater loudness.
- **Conclusion for Option 2:**
- This statement is correct.

### Step 3: Analyze Option 3
**Statement:** Higher pitch means higher frequency of vibration.

- **Understanding Pitch and Frequency:**
- Pitch is the perceived frequency of a sound; higher pitch indicates a higher frequency.
- **Conclusion for Option 3:**
- This statement is correct.

### Step 4: Analyze Option 4
**Statement:** More the value of decibel, higher is the noise.

- **Understanding Decibels and Noise:**
- The decibel (dB) scale is a logarithmic scale used to measure sound intensity.
- A higher decibel level indicates a higher intensity of sound, which corresponds to louder noise.
- **Conclusion for Option 4:**
- This statement is correct.

### Final Conclusion
After analyzing all options, we find that:
- **Option 1** is the only statement that is NOT correct.

### Answer:
**The statement that is NOT correct is: "More oscillation per second means higher time period."**

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