For radioactive decay:
N = N(0) x exp(-λt), where λ is the decay constant equivalent to ln(2)/half life, N is the amount after a given amount of time, t is the time passed and N(0) is the initial amount.
1)
N = 24 x exp(-ln(2)/4.5 x 36)
N = 0.09375 mg
2)
1.2 = 9.6 x exp(-ln(2)/4.5 x t)
ln(1.2/9.6) = -t x ln(2)/4.5
t = 13.5 days
Answer:
Physical change.
Explanation:
the molten metal is simply hardening in shapes. The identity of the metal is not changing.
Answer:
I don't know what the list is but I assume it is volume
