(Q16-Q18) A thin zinc rod is suspended vertically. The rod is 1.6 m long and has a square cross section 1.4 mm (1.4 X 10"m) on a side. When you hang a mass of 12 kg from the end of the rod, you find that the rod stretches 9.6 x 10"m. Zinc has a atomic (molar) mass of 65.38g/mol, and a density of 7.1 grams per cubic centimeter (7100-5). (Q16) What is Young's modulus of zinc? Select one: A. 1 X 10" (N/m2) B. 1 x 10" (N/m) . C. 9.8 x 10" (N/m?) x D. 9.8 x 10" (N/m) E. 7100 (N) (Q17, from Q16) What is the interatomic spring stiffness of the rod of zinc? Select one: A. 3.38 x 10 3 (N/m) B. 9.6 x 10" (N/m) C. 24.82(N/m) . D. 1.4 X 10 3(N/m) x E. 3.38 x 1033 (N) (Q18, from Q16) What is the speed of sound in zinc? Select one: A. 7100 (m/s) B. 340 (m/s) . C. 1.4 X 105 (m/s) x D. 3753 (m/s) E. 24.82 (m/s)