Here's what you need to know about Hertz:

* Definition: One Hertz represents one cycle per second. A cycle refers to a complete repetition of a periodic event, like a wave.

* Meaning: A higher frequency means more cycles occur in a given amount of time.

* Examples:

* A radio station broadcasting at 100 MHz (megahertz) means its waves complete 100 million cycles per second.

* Your heart beats at about 1 Hz (one beat per second).

How frequency is measured:

* Direct Measurement: Some devices, like oscilloscopes, can directly measure the time it takes for one cycle to complete. The reciprocal of this time gives the frequency.

* Indirect Measurement: In some cases, we can deduce frequency from other measurements. For instance, if we know the wavelength of a wave, we can calculate its frequency using the formula:

* frequency = speed of the wave / wavelength

Let me know if you have more questions about frequency or specific types of measurements!