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/sci/ - Science & Math

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2297930 No.2297930 [Reply] [Original]

why don't copper wire or pennies decay away in a few weeks?

>> No.2297945

But that's wrong, you fucking retard.

>> No.2297950

I started typing an explanation about how pennies were actually made of zinc and copper alloy, and therefore wouldn't corrode quickly.

Then I read your title.

>> No.2297954

>>2297930
[citation needed]

>> No.2297960

>copper has a halflife of 81 hours
>no mention of isotope
LOL WHAT

>> No.2297976

It needs to be an isotope; radioactive. Once it reaches, can't remember the amount of protons, but once it becomes stable, it can't decay anymore.

>> No.2297983

>>2297954
http://www.wolframalpha.com/entities/isotopes/copper_64/de/oh/g4/

half-life: 12.701 hours
lifetime: 18.323 hours

>However, higher purity is more expensive, particularly as you go beyond 99.99% purity (100 ppm impurities) so a compromise is used. Copper is fairly strong so most electrical wire is commercially pure 99.95% or better to get high conductivity. Aluminum is not as strong so the wire is normally alloyed a little copper and tempered to increase the strength so that the wire does not stretch and sag under its own weight.

http://www.evergreengardenworks.com/copperwi2.htm

>> No.2297999

the anser is
becuz ur mum is a ho

>> No.2298008

>>2297983
Copper 64 is nearly nonexistent naturally, for obvious reasons. It's naturally found as Cu63 and Cu65.