Answer:
Explanation:
Given
Length of cable 
Diameter of cable 
time taken to return to original position 
time taken to cover distance L

velocity

(b)Relation between velocity of wave Tension is
mass per unit Length



where 



B. As job efficiency increases, stress levels decline (THIS IS WRONG)I think its between A. As job efficiency decreases, stress levels increaseD. As stress levels increase, job efficiency increases