Multiple Choice Question Answer XXV — task. Science CBSE, Class 9.

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1. Which isotope is used in treatment of cancer ?

2. The charge of an electron is

Answer variants:

$1.6$ x

$10^-{^1}{^9}$ C

Iodine-131

$3.2$ x

$10^-{^1}{^9}$ C

Cobalt-60

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