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# Help with this Q plz watch

1. The maximum kinetic energy which an alpha particle can transmit to an electron occurs during a head on elastic collision.

Calculate the KE lost by an a-particle of initial energy 6.2MeV in such a collision

When I try to work it out by using momentum the velocity of the electron is always greater than 3*10^8 which is bs so I'm confused
2. (Original post by Maaz69)
The maximum kinetic energy which an alpha particle can transmit to an electron occurs during a head on elastic collision.

Calculate the KE lost by an a-particle of initial energy 6.2MeV in such a collision

When I try to work it out by using momentum the velocity of the electron is always greater than 3*10^8 which is bs so I'm confused
What is stopping the alpha particle travelling int he same direction as the electron? also, its an elastic collision, so what does that tell you about the energy after the collision?
3. (Original post by an_atheist)
What is stopping the alpha particle travelling int he same direction as the electron? also, its an elastic collision, so what does that tell you about the energy after the collision?
i knew about the energy part but i didnt clock the travelling in same direction part. Thanks man I'll try it again

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