how 25ev electron has a speed of 3x106m/s explain plz
zulqarnain said:
how 25ev electron has a speed of 3x106m/s explain plz
maaz said:
so simple
25eV is the given kinetic energy of electron which is equal to 1/2mv2.....
first convert eV into joules by multiplying it by the charge of an electron and then apply the formula....1/2mv2...
pari said:
please explain 25eV is = 3×10-6 m/s
Farman sahil said:
K.E=1/2mv^2
K.E=2heV
=> 25×1.6×10^-19 J
=> 40×10^-19 J
Now
40×10^-19=1/2 (9.11×10^-31) v^2
1/2 (v^2)=40×10^-19/9.11×10^-31
1/2 v^2 =4.3×10^12
V^2=9×10^12
V=square root of 9×10^12
V=3×10^6 m/s
