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NEET levelSingle correct optionDifficulty 1 of 3as170

One curie is defined as $3.7 \times 1 0^{10}$ disintegrations per second. The activity of a $2.0 mCi$ source, in disintegrations per second, is

A $7.4 \times 1 0^{10}$
B $7.4 \times 1 0^{7}$
C $3.7 \times 1 0^{7}$
D $1.85 \times 1 0^{13}$

Answer: B

2.0 mCi = 2.0 \times 1 0^{- 3} Ci

. Activity

= 2.0 \times 1 0^{- 3} \times 3.7 \times 1 0^{10} = 7.4 \times 1 0^{7} dps

.

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