Assertion A- The half life of a radioactive isotope is equal to 0-693- -Reason R- Radioactivity is a first order reactionThe correct answer is

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Standard XII

Chemistry

Wurtz Halide Reaction

Assertion A: ...

Question

Assertion (A): The half life of a radioactive isotope is equal to $\frac{0.693}{λ}$ .
Reason (R): Radioactivity is a first order reaction
The correct answer is

Both A and R are true and R is correct explanation of A

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Both A and R are true and R is not the correct explanation of A

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A is true but R is false

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A is false but R is true

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Solution

The correct option is A Both A and R are true and R is correct explanation of A
From formula, for first order reaction:

$N = N_{0} e^{- λ t}$

$t_{\frac{1}{2}} = \frac{l n 2}{λ} = \frac{0.693}{λ}$
So, the reason and Assertion hold true for each other.

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Assertion (A): The half life of a radioactive isotope is equal to 0.693λ .Reason (R): Radioactivity is a first order reactionThe correct answer is

The correct option is A Both A and R are true and R is correct explanation of AFrom formula, for first order reaction: N=N0e−λt t12=ln2λ=0.693λSo, the reason and Assertion hold true for each other.

Assertion (A): The half life of a radioactive isotope is equal to $\frac{0.693}{λ}$ .
Reason (R): Radioactivity is a first order reaction
The correct answer is

The correct option is A Both A and R are true and R is correct explanation of A
From formula, for first order reaction:

$N = N_{0} e^{- λ t}$

$t_{\frac{1}{2}} = \frac{l n 2}{λ} = \frac{0.693}{λ}$
So, the reason and Assertion hold true for each other.