Physics Question Help Please (1 Viewer)

[xXmuffin0manXx]

If an electron is accelerated by the electric force across a potential difference of 2500V, how much kinetic energy will the electron gain and what will its final velocity be?

Thank you!!

Ohh..and working out please

 

[darkchild69]

If an electron is accelerated by the electric force across a potential difference of 2500V, how much kinetic energy will the electron gain and what will its final velocity be?

Thank you!!

Ohh..and working out please

The work done by an electron across a potential difference = the charge*potential difference = change in KE

so 2500q = 1/2mv^2 (electron gains 4x10^-16J)

5000*q = mv^2

v = [(5000*q)/m]^1/2

v = 2.97*10^7m/s

 

[xXmuffin0manXx]

v = [(5000*q)/m]^1/2

v = 2.97*10^7m/s

could you please explain how you calculated for m?

 

[darkchild69]

v = [(5000*q)/m]^1/2

v = 2.97*10^7m/s

could you please explain how you calculated for m?

m = mass of electron (in data sheet. I think it's 9.109x10^-31kg)
q = charge on electron (also in data seet. 1.602x10^-19C)