A radioavtive source in the form of a me...

A radioavtive source in the form of a metal sphere of daimeter `10^(-3)` m emits `beta`-particles at a constant rate of `6.25 xx 10^(10)` particles per second. If the source is electrically insulated, how long will it take for its potential to rise by `1.0 V`, assuming that `80%` of the emitted `beta`-particles escape the socurce?

6.95 `mu` sec

0.95 `mu` sec

1.95 `mu` sec

2.15 `mu` sec

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