A steady beam of `alpha`-particles travelling with kinetic energy `E=83.5 keV` carries a current of `I=0.2 mu A`. Mass of `alpha`-particle `=6.68 xx10^(-27)kg`.
(i) If this beam strikes a plane surface at an angle `theta=60^@` with normal to the surface, how many `alpha` -particles strike the surface in t=4 second?

A narrow beam of alpha particles with kinetic energy T== 0.50 MeV falls normally on a golden foil whose t=mass of thickness is rho d= 1.5 mg//cm^(2) The beam intensity is I_(0)= 5.0.10^(5) particles per second. Find the number of alpha particles scattered by the foil during the time interval tau=30 m in into the angular interval: (a) 59-61^(@) , (b) over theta_(0)=60^(@) .

A narrow beam of alpha particles with kinetic energy T= 600 ke V falls normally on a golden foil incorporating n = 1.1.10^(19) nuclei //cm^(2) . Find the fraction of alpha particles scattered thtough the angles theta lt theta_(0)= 20^(@)

A narrow beam of alpha particles with kinetic energy 1.0 MeV falls normally on a platinum foil 1.0 mu thick. The scattered particles are observed at an angle of 60^(@) to the incident beam direction by means of a counter with a circular inlet area 1.0 cm^(2) located at the distacne 10 cm from the scattering section of the foil. What fraction of scattered alpha particles reaches the counter inlet?

A beam of charged particles having kinetic energy 10^3eV and containing masses 8xx10^(-27)kg and 1*6xx10^(-26)kg , emerges from the end of an accelerated tube. There is a plate at a distance 10^-2m from the end of the tube and placed perpendicular to the beam. Calculate the magnitude of the smallest magnetic field which can prevent the beam from striking the plate.

A narrow beam of alpha particles with kinetic energy T= 0.50MeV and intensity I= 5.0.10^(5) particles per second falls normally on a golden foil. Find the thickness of the if at a distance r=15 cm from a scattering section of that foil the flux density of scatteered particles at the angle theta = 60^(@) to the incident beam is equal to J= 40 particles //(cm^(2).s) .

A beam of charged particle, having kinetic energy 10^3 eV , contains masses 8xx10^(-27) kg and 1.6xx10^(-26) kg emerge from the end of an accelerator tube. There is a plate at distance 10^2 m from the end of the tube and placed perpendicular to the beam. Calculate the magnitude of the smallest magnetic field which can prevent the beam from striking the plate.

A beam of charged particle, having kinetic energy 10^3 eV , contains masses 8xx10^(-27) kg and 1.6xx10^(-26) kg emerge from the end of an accelerator tube. There is a plate at distance 10^2 m from the end of the tube and placed perpendicular to the beam. Calculate the magnitude of the smallest magnetic field which can prevent the beam from striking the plate.

An alpha- particle of mass 6.65xx10^(-27) kg travels perpendicular to a magnetic of 0.2 T with a speed of 6xx10^(5)ms^(-1) . Calculate the acceleration of the alpha- particle. Given the charge on the electron is 1.6xx10^(-19)C .