ANSWER ASAP. TIMED! FILL IN THE BLANK PLZZZ

In a transverse wave, ________ is measured from crest to crest or trough to trough.

If two waves collide and form a temporary smaller wave, the interference is __________.

At the ______ of a standing wave, there is no displacement from the rest of the position.

The standard measure used to sound intesities is the __________.