Question

HALF-LIFE OF RADIUM IS 1620 YEARS.
ATOMIC WEIGHT IS 226.
NO OF ATOMS DECAY IN ONE GRAM PER SECOND WILL BE ___?___.

Answer 1

Explanation:

The half-life of radium is 1620years and its atomic weight is 226. The number of atoms that will decay from its 1g sample per second will be . =3.61×1010

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Answer 2

Answer:

T

1/2

=1620 years

∴λ= T 1/2

0.693

= 1620×365×24×3600

0.693

=1.356×10 −11

Number of atoms of thorium in 1 gram,

N= 226

6.023×10 23

=2.67×10 21

According to radio active decay law,

dtdN

=−λN=1.356×10 −11

×2.67×10 21

=3.6×10

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