Thomson experiment question (1 Viewer)

[Doosra]

I'm trying to work out a question where you have to use the charge and mass of an electron to determine the velocity of an electron that has been accelerated across a potential difference of 100000 volts.

I can work out the energy using E=qV but then I cant find any equations that will give me the velocity?

I tried to use the kinetic energy equation E = 1/2mv^2 but i got an answer that was almost 60%of the speed of light, which seems rather wrong.

 

[Doosra]

no, that was the problem. If i was given magnetic field strength or initial velocity then it would have been easier.

 

[Steth0scope]

Electrons can travel 0.6c. It might be right. Don't u have the answer ?

 

[Klaxon]

I'm trying to work out a question where you have to use the charge and mass of an electron to determine the velocity of an electron that has been accelerated across a potential difference of 100000 volts.

I can work out the energy using E=qV but then I cant find any equations that will give me the velocity?

I tried to use the kinetic energy equation E = 1/2mv^2 but i got an answer that was almost 60%of the speed of light, which seems rather wrong.

Hey, chances are that you could have this question right. 0.6c is not very fast you know (for an electron anyway).

 

[tommykins]

F = qvBsin@

 

[tommykins]

oh right, didn't read his post properly.

thanks