The activity of a radioactive substance is R₁ at time t₁ and R₂
at a later time instant t₂. Its decay constant is ????. Then,
(a) R₁t₁ = R₂t₂
(b) R₂ exp (???? t₂) = R₁ exp (???? t₁)
(c) R₂ = R₁ exp [???? (t₂ – t₁)]
(d) R₁ – R₂ = a constant (t₂ – t₁)
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a. is the correct answer
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