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Help for A-level student is required

Could you please show me the working for the resistivity of constantan and tell me what constantan is? I would much appreciate it for my a-level physics coursework.

Thanks,

Sean Kielty
- Manchester, Greater Manchester, England
2003

Constantan is an alloy of 57copper and 43 nickel. It has a resistivity of 49 X 10^-8 Ohm-metres or 294 Ohms per mil-foot.

Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
2003

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