CBSE Class 12-science Answered
At comparitively low voltages the electrons acquire relativistiv speeds due to their small mass.
The other disadvantage of using electrons is that while bombarding other particles they are not very suitable due to their small mass. You can read more at this url.http://wiki.answers.com/Q/Why_are_electrons_not_accelerated_by_a_cyclotron&src=ansTT
We don't fire up a cyclotron to accelerate electrons to do atom smashing. That's inefficient. We use protons for bullets. We can also use protons with an attached neutron, like from heavy water. And we can also use light nuclei, too. Imagine a helium nucleus. It's got two protons and two neutrons (most of the time). We can take helium and strip off the two electrons and use that nucleus (which is an alpha particle) to smash stuff! Bam! Now we're talkin' atom smasher! Bigger bullets