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type 1a supernova are the thermonuclear explosions of accreting white dwarfs that approach the Chandrasekhar limit....

type 1a supernova are the thermonuclear explosions of accreting white dwarfs that approach the Chandrasekhar limit. in this problem, consider a white dwarf of mass 1.4 solar masses and radius 10^4 km.

Assume the entire star become Nickel-56 after the explosion. how long will it take all the Nickel-56 to decay into Iron-56?
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