1. Hand speed 1.He should move his hand up and down more quickly 2.He should move his hand up and down more slowly 3.Neither (1) nor (2) will change the time for the pulse to reach the wall

2. String 1.He should use a heavier string of the same length, under the same tension 2.He should use a lighter string of the same length, under the same tension 3.Neither (1) nor (2) will change the time for the pulse to reach the wall

3. Hand distance 1.He should displace his hand a greater distance up and down but at the same speed 2.He should displace his hand a lesser distance up and down but at the same speed 3.Neither (1) nor (2) will change the time for the pulse to reach the wall

4. Tension 1.He should pull the string harder to increase the tension in the string 2.He should pull the string less hard to decrease the tension in the string 3.Neither (1) nor (2) will change the time for the pulse to reach the wall

5. With student 1.The travel time does not change because the tension in the rope is the same 2.The travel time gets longer because the tension in the rope is greater 3.The travel time gets shorter because the tension in the rope is greater