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What is the tensile strength of pure annealed copper?

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in Casting-Forming-Welding II by (119k points)
What is the tensile strength of pure annealed copper?

(a) 324 MPa

(b) 676 MPa

(c) 759 MPa

(d) 209 MPa

The question was posed to me by my college director while I was bunking the class.

I'm obligated to ask this question of Copper Alloys topic in chapter Foundry Introduction & Materials of Casting-Forming-Welding II

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Best answer
Right option is (d) 209 MPa

To explain I would say: None.

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