Question

If electrons are caused to fall through a potential difference of 10000V determine final speed if they were initially at rest

Answer 1

Here ,
potential energy of electron = kinetic energy of electron
eV = mv²/2

where V is potential difference
e is change of electron
m is mass of electron
V is velocity of electron
now,
1.6 × 10^-19 × 10000 = 9.1 × 10^-31 ×v²/2
3.2 × 10^-15/9.1 × 10^-31 = v²
v² = 0.3516 × 10^16
v = 0.59 × 10^8 m/s