The half life of radioactive sample undergoing a-decay is 1.4 × 1017 s . If the number of nuclei in the sample is 2.0× 1021 , the activity of the sample is nearly :

Question

The half life of radioactive sample undergoing a-decay is 1.4 × 1017 s . If the number of nuclei in the sample is 2.0× 1021 , the activity of the sample is nearly : (A) 104 Bq (B) 105 Bq (C) 106 Bq (D) 103 Bq

Tardigrade Admin · Accepted Answer

R=λ N R=(0.693/T)× N R=(0.693/1.4× 1017) × 2× 1021 R=104

Q. The half life of radioactive sample undergoing a-decay is $1.4 \times 1 0^{17} s$ . If the number of nuclei in the sample is $2.0 \times 1 0^{21}$ , the activity of the sample is nearly :

$1 0^{4} Bq$

$1 0^{5} Bq$

$1 0^{6} Bq$

$1 0^{3} Bq$

$R = λ N$
$R = \frac{0.693}{T} \times N$
$R = \frac{0.693}{1.4 \times 1 0 ^{17}} \times 2 \times 1 0^{21}$
$R = 1 0^{4}$

Q. The half life of radioactive sample undergoing a-decay is 1.4×1017s . If the number of nuclei in the sample is 2.0×1021 , the activity of the sample is nearly :

104Bq

105Bq

106Bq

103Bq