A child is playing with a string that is fixed at one end. By moving their hand up and down, they can generate a wave pulse. How can they make the pulse move slower? (Select ALL that apply). They can use a heavier string of the same length. They can use a lighter string of the same length. They can tighten the string tension. They can loosen the string tension. They can move their hand up and down at a slower speed. They can move their hand up and down a larger distance