Suppose you shake the end of a stretched string to produce a wave. Which of the following actions would increase the speed of the wave down the string? There may be more than one correct answer; if so, give all that are correct.

A. Move your hand up and down more quickly as you generate the wave.

B. Move your hand up and down a greater distance as you generate the wave.

C. Use a heavier string of the same length, under the same tension.

D. Use a lighter string of the same length, under the same tension.

E. Stretch the string tighter to increase the tension.

F. Loosen the string to decrease the tension.