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Question: m gram of a radioactive species (at. Mass M) has decay constant l. The initial specific activity at ...

m gram of a radioactive species (at. Mass M) has decay constant l. The initial specific activity at zero time is given by

A

l .NAM\frac{N_{A}}{M}

B

l .NA⋅mM\frac{N_{A} \cdot m}{M}

C

λmM\frac{\lambda m}{M}

D

m Mel

Answer

l .NAM\frac{N_{A}}{M}

Explanation

Solution

Specific activity = rate per g or ds–1g–1

= l . NA×mM×m\frac{N_{A} \times m}{M \times m}= l . NAM\frac{N_{A}}{M}