**Amplitude**, Period, Phase Shift and Frequency. Some

**functions**(like Sine and Cosine) repeat forever. and are called Periodic

**Functions**. The Period goes from one peak to the next (or from any point to the next matching point): The

**Amplitude**is the height from the center line to the peak (or to the trough).

Correspondingly, is the amplitude always positive?

**Amplitude**.

**Amplitudes**are

**always positive**numbers (for example: 3.5, 1, 120) and are never negative (for example: -3.5, -1, -120).

**Amplitudes**are

**positive**because distance can only be greater than zero or equal to zero; negative distance does not exist.

What is the amplitude of a sine wave?

This function has an amplitude of 1 because the graph goes

**one unit**up and**one unit**down from the midline of the graph. This function has a period of**2π**because the sine wave repeats every**2π**units.What is amplitude how is it measured?

The

**amplitude**of a wave refers to the maximum amount of displacement of a particle on the medium from its rest position. In a sense, the**amplitude**is the distance from rest to crest. Similarly, the**amplitude**can be**measured**from the rest position to the trough position.