Answers

2014-10-08T17:13:34+05:30
Equation of energy of electron
E=eV₀.......where E is energy,
                             e is the charge on the electron,
                             V₀ is stopping potential.
Therefore,E=1.6*10^-19×2*10^7
                      =3.2*10^-12
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1/4π∈o x pcostheta/ (r^2-a^cos^theta)
can this formula be used
sry its r^2-a^2 cos^2theta
probably noo..!!
but what about the mass 9.1x10^-31
2014-10-08T19:54:17+05:30
Energy of a photon E=ev where e=charge of electron=1.6 x10*-19    v=2 x10*7m/s then E= 1.6 x 2 x10*-19 x10*7=3.2 x10*-12j
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