A radioactive source, in the form of a metallic sphere of radius `10^(-2)m` emits `beta-`particles at the rate of `5xx10^(10)` particles per second. The source is electrically insulated. How long will it take for its potential to be raised by `2V`, assuming that `40%` of the emitted `beta-`particles escape the source.

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?

A radioactive source in the form of a metal sphere of diameter 3.2×10^ −3 m emits β-particle at a constant rate of 6.25×10^ 10 particle/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 time

A 16 muF capacitor , initially charged to 5 V, is started charging at t=0 by a source at the rate of 40 tmuCs^(-1) . How long will it take to raise its potential to 10 V?

Calculate t_(3//2) for Am^(241) in years given that it emits 1.2 xx 10^(11) alpha -particles per gram per second

A monochromatic light source of frequency 6xx10^(14)Hz is emitting energy at the rate 2xx10^(-3)J//s . Calculate the number of photons emitted per seconds by source.

A particle of mass 1 g and charge 2. 5 xx10^(-4) C is released from rest in an electric field of 1.2 xx 10^4 NC^(-1) (a) Find the electric force and the force of gravity acting on this particle. Can one of these forces be neglected in comparison with the other for approximate analysis? (b) How long will it take for the particle to travel a distance of 40 cm? (c) What will be the speed of the particle after travelling this destance? (d) how much is the work done by electric force on the particle during this period?

An electric gum emits 2.0xx10^(16) electrons per second. What electric current does this correspond to ?

The atomic weight of radius is 226. It is observed that 3.67 xx 10^(10) " " alpha- particles are emitted per second from one gram of radium. Calculate in years the half period of radium.