A radioactive source in the form of a metal sphere of diameter 3.2×10^−3m emits β-particle at a constant rate of 6.25×10^10particle/sec. The source is electrically insulated and all the β-particle are emitted from the surface. The potential of the sphere will rise to 1 V in timeA. `180 mus`B. `90 mus`C. `18mus`D. `9mus`

A radioactive source in the form of a metal sphere of diameter 3.2×10

1.	A radioactive source in the form of a metal sphere of diameter 3.2×10^−3m emits β-particle at a constant rate of 6.25×10^10particle/sec. The source is electrically insulated and all the β-particle are emitted from the surface. The potential of the sphere will rise to 1 V in timeA. `180 mus`B. `90 mus`C. `18mus`D. `9mus`
Answer» Correct Answer - C

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