You create a pulse on a stretched spring by moving, with your hand, one part of the spring up and down once. The leading edge of the pulse travels a distance L in a time T. If you wanted to decrease T what could you do?

1. Move your hand further in the same time interval (1/32) (3%)
2. Move your hand up and down the same distance in less time (4/32) (12%)
3. Increase the tension in the spring (3/32) (9%)
4. Use a spring with a smaller mass per unit length, but having the same tension (0/32) (0%)
5. All of the above (3/32) (9%)
6. 1 or 2 (4/32) (12%)
7. 3 or 4 (6/32) (19%)
8. 2, 3, or 4 (11/32) (34%)
9. Some other combination (0/32) (0%)