1.

The amount of ._(53)I^(128) (t_(1//2) = 25 minutes) left after 50 minutes will be

Answer»

One-half
One-third
One-fourth
Nothing

Solution :The AMOUNT of `._(53)I^(128)` left after 50 minutes will be
= 25 minutes `= (100)/(25) = (1)/(4)`


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