Electrical energy is sold by the kilowatt hour How much would it cost to heat a hot tub from 15 to 43
1 answer:
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T = half life period of decay for atoms of element A = 20,000 years
N₀ = initial number of atoms of element A = 10,000 atoms
N = final number of atoms after time "t" = 2500 atoms
t = time of decay = ?
λ = decay constant = ?
decay constant is given as
λ = 0.693/T
λ = 0.693/20,000
λ = 0.00003465 years⁻¹
atoms after decay for time "t" is given as
N = N₀
inserting the values
2500 = (10000)
t = 40,000 years
so correct choice is
B) 40,000 years