Atomic StructureMedium
Question
Figure shows an electron gun that emits electrons at very small angel with axis. The paraxial electrons emitted from the cathode (filament) are refocused at a distance s after accelerating through a potential difference V, s is given by (Take π2 = 10) :-
Options
A.s = 2
B.s =
C.s = 
D.None of these
Solution
eV = 
mv2 ⇒ v = 
and T = 
so S = vT =
Thus A option is correct
mv2 ⇒ v = and T = so S = vT =
Thus A option is correct
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