A spring has a length of 1.0 meter when there is no tension on it. The spring is then stretched between two points 10 meters apart. A wave pulse travels between the two end points in the spring in a time of 1.0 seconds. The spring is now stretched between two points that are 20 meters apart. The new time it takes for a wave pulse to travel between the ends of the spring is closest to
Answer Choices
A. 0.5 seconds
B. 0.7 seconds
C. 1 second
D. 1.4 seconds
E. 2 seconds