An electron of charge 1.6 x 10-19C and mass 9.1 x 10-31kg is accelerated between two metal plates with a velocity of 4 x 107ms-1, the potential difference between the plates is
a
4.55 x 103V
b
4.55 x 102V
c
9.10 x 101V
d
4.55 x 101V
Explanation
Correct Option
aVideo Explanation
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Discussions (9)
Derek644222
2 years ago
using the formula
eV = 1/2mv²
Where e = electronic charge = 1.6 x 10^-¹⁹C
V = accelerating voltage or potential difference (V)
M= mass of electron 9.1 x 10^-³¹kg
v = velocity of electron ms-1
there we were asked to find V
hence V = (1/2mv²)/e
= (0.5x9.1×10^-³¹)x (4×10⁷)² ÷ (1.6× 10^-¹⁹)
= 4550 or 4.55×10^³
option A is correct 
clemtommy
12 years ago
wel,i may belive dis cause kinetic energy is dat due to it's motion.dis particle in motion has kinetic energy.THANKS Admin.
