A radioactive source in the form of a metallic sphere of radius 10−2 m emits β− particles at the rate of 5×1010 particles per second. The source is electrically insulated. How long (in μs) will it take for its potential to be raised by 2 V?Assume that 40 % of the emitted β− particles escape from the source.Round off to the nearest integer.

A radioactive source in the form of a metallic sphere of radius 10−2

1.	A radioactive source in the form of a metallic sphere of radius 10−2 m emits β− particles at the rate of 5×1010 particles per second. The source is electrically insulated. How long (in μs) will it take for its potential to be raised by 2 V?Assume that 40 % of the emitted β− particles escape from the source.Round off to the nearest integer.
Answer» A radioactive source in the form of a metallic sphere of radius $10^{- 2} m$ emits $β -$ particles at the rate of $5 \times 10^{10}$ particles per second. The source is electrically insulated. How long $($ in $μ s)$ will it take for its potential to be raised by $2 V ?$ Assume that $40 %$ of the emitted $β -$ particles escape from the source. Round off to the nearest integer.