The youngs modulus of nickel is y 2 x 1011 nm2 its molar

Question

Question: The Young's modulus of nickel is Y = 2 x 1011 n/m². It's molar mass is 0.059 kg and its density is 8900 k/m³. Given bar of nickel of length 18 m.

Part A: What time does it take for sound waves to propagate from one end to the other? Avogadro's number is 6.02 x 10²³ atoms.

Answer in units of s

Please provide a detailed response this is a practice test question so I have the answer just cannot figure out how to get to it.