*Question T5A06:
What is the unit of frequency?*  

*Correct Answer is  A: Hertz*  

### AI Response: (may contain errors)  

The correct answer to the question about the unit of frequency is Hertz.

1. **Why the correct answer is correct:**
   - The unit of frequency is defined as the number of cycles per second. This is measured in Hertz (Hz). For example, if a radio wave oscillates 1,000 times in one second, its frequency is 1,000 Hz or 1 kHz.

2. **Why the other choices are incorrect:**
   - **Henry (B):** This is the unit of inductance, which measures the ability of a conductor to store energy in a magnetic field when an electric current flows through it.
   - **Farad (C):** This is the unit of capacitance, which measures a capacitor's ability to store electrical energy in an electric field.
   - **Tesla (D):** This is the unit of magnetic flux density, which measures the strength of a magnetic field.

3. **Useful formulas or rules of thumb:**
   - The relationship between frequency ($f$) and period ($T$) is given by:
     $$f = \frac{1}{T}$$
   - Where:
     - $f$ = frequency in Hertz (Hz)
     - $T$ = period in seconds (s)

This formula shows that frequency is the inverse of the time period of a wave, reinforcing that Hertz is indeed the correct unit for measuring frequency.