Question

The half-life of krypton is 10.756 y. Calculate the number of disintegrations per second
of 2.25 g of krypton.
(a) 3.25 x 1010 /
(b) 3.3x1013 /s
(c) 3.61x101° /s
(d) 4.25 x1013 /s​

Answer 1

Answer:

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Answer 2

Answer:

b

Explanation:

t1/2 is 10.756 yrs or 0.339 × 10⁹

number of atoms (N) of kr in 2.25 gm

2.25/83.8× 6.023 × 20²³ = 16 × 10²¹

disintegration per sec

-dN/dt = lambda N = 0.693/ t1/2 × N

0.693/0.339 × 10⁹ × 16 × 10²¹

further solving we get 33 × 10¹²

or 3.3 × 10¹³

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