Question

What is the amplitude of the function below?

Answer 1

The amplitude is 2 or B.

Answer 2

ANSWER

The amplitude is
$2$


EXPLANATION

The amplitude is the height of the function from the centre line which is
$y = 0$

to the peak or trough of the graph, which is
$y = 2$
This means that,
$amplitude = |2 - 0| = 2$


Or

The amplitude is distance between the lowest point on the graph and the highest point on the graph divided by 2.


$amplitude = \frac{1}{2} |2 - - 2| = \frac{1}{2} \times 4 = 2$