Hello. So I am having some trouble answering this question and I would really appreciate some help. I figure I should probably first define what standing waves are and I know that they are the result of the repeated interference of two waves of identical frequency while moving in opposite directions along the same medium or in this case, the string. Im just not sure how to answer the question. I know that in order the there to be a standing wave, the string needs to be moving or vibrating but Im not sure where fixed at both ends comes in.