Hertz stands for

Options

A. second
B. second
C. meter
D. meter

Explanation

To answer the question "Hertz stands for," we can break it down into a few steps:

### Step-by-Step Solution:

1. **Understanding Frequency**:
- Frequency is defined as the number of occurrences of a repeating event per unit of time. In physics, it is commonly used to describe waves, including sound waves.

2. **SI Unit of Frequency**:
- The standard unit of frequency in the International System of Units (SI) is Hertz (Hz).

3. **Origin of the Term Hertz**:
- The term "Hertz" is named after Heinrich Hertz, a German physicist who made significant contributions to the study of electromagnetic waves.

4. **Definition of Hertz**:
- One Hertz is defined as one cycle per second. This means if a wave completes one full cycle in one second, its frequency is 1 Hz.

5. **Relation to Time**:
- Since frequency is inversely related to the time period (T) of a wave, we can express frequency (f) as:
\[ f = \frac{1}{T} \]
- Here, T is the time period measured in seconds.

6. **Conclusion**:
- Therefore, Hertz (Hz) stands for cycles per second, which can also be expressed in terms of seconds (s) as the unit of time.

### Final Answer:
Hertz stands for cycles per second (Hz), which is the SI unit of frequency.

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