Visit http://ilectureonline.com for more math and science lectures!

To donate:
http://www.ilectureonline.com/donate
https://www.patreon.com/user?u=3236071

An electron with kinetic energy K1 enters between parallel plates of a capacitor at an angle “alpha” with the plates. It leaves the plates at angle “beta” with kinetic energy K2. Then the ratio of kinetic energies K1:K2 will be:
A) [sin(beta)]^2/[cos(alpha)]^2
B) [cos(beta)]^2/[cos(alpha)]^2
C) sin(beta)/cos(alpha)
D) cos(beta)/cos(alpha)

Previous video in this series can be seen at:
https://youtu.be/xjIx3Yx89Vw
Next video in this series can be seen at:
https://youtu.be/3qhn86Lil8A