Question

For incomplete cancellation to occur, opposite pulses must have.

equal displacements

Answer 1

What does incomplete mean?

Answer 2

My book has an example or whatever and it says word for word: If the opposite pulses have unequal amplitudes, cancellation is incomplete.

my answer book may have a typo because my choices are:

A)equal amplitudes
B)different energies
C)equal pulses
D)equal displacements

I think A should read UNequal amplitudes and then I would choose that. I am reading the questions carefully that's how I figure out how to go about solving them and where to look in my book. If A is not a typo, is that still the answer? incomplete means not finished. I know what they mean in my book I hope you knew that already