Jerry speaks out loud to the class. He then speaks through a paper towel cylinder. What happens to the diffraction of his voice with the cylinder? Jerry speaks out loud to the class. He then speaks through a paper towel cylinder. What happens to the diffraction of his voice with the cylinder? diffraction decreases because of larger slit width diffraction decreases because of smaller slit width diffraction increases because of larger slit width diffraction increases because of smaller slit width