Answer:
The effect that the repetition of the word louder has on the passage is that it helps build suspense
Explanation:
The main character planned the murder in " The Tell-Tale Heart" by Edgar Allan Poe, everything seems to be going well until the police knocked at his door, he started to give the tour with calm but as time passed by he started to hear this sound that was louder, louder, louder, this starts making the character act with despair, because he is facing his fears.
