8 g of Cu66 undergoes radioactive decay and after 15 minutes only 1 g remains. The half-life, in minutes, is then
15 ln (2) / ln(8)
15 ln (8) / ln (2)
15/8
8/15
A.
Given,
m0 = 8 g
m = 1 g
Time of decay = 15 min
ln MM0 = - λt⇒ ln 18 = - λ (55)∴ λ = ln 815So, T1/2 = ln 2λ = 15 ln 2ln 8
For a light nuclei, which of the following relation between the atomic number (Z) and mass number (A) is valid ?
A = Z/2
Z = A
Z = A/2
Z = A2
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