Question

how do you determine the amplitude of a transverse wave

Answer 1

To determine the amplitude of a transverse wave, measure the highest amount of disturbance from the equilibrium that the wave experiences.

Answer 2

Answer:

The amplitude of a transverse wave is the difference between the height of  crest which is the maximum point and the resting position the minimum point of one curve of a wave.

Please look at the attachment to see the figure to make the answer more clear.

Transverse waves are those that moves in the direction along x-axis