Answer:
young's modulus
Explanation:
We have given length of tendon L= 13 cm =0.13 m
Change in length 
Force = 12.1 N
Average diameter d =8.8 mm
So 
Area 
Now stress 
Strain 
Now young's modulus
According to the dictionary, amplitude is: "<span>the maximum extent of a vibration or oscillation, measured from the position of equilibrium."
Hope this helps, and happy studying~!
~{Dunsforhands}</span>