1.

The half-life (T) and the disintegration constant \[(\lambda )\]of a radioactive substance are related as [MP PMT/PET 1998]

A.            \[\lambda T=1\]                 
B.            \[\lambda T=0.693\]
C.   \[\frac{T}{\lambda }=0.693\]  
D.            \[\frac{\lambda }{T}=0.693\]
Answer» C.   \[\frac{T}{\lambda }=0.693\]  


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