1.

An electron traveling in a uniform electric field passes from a region of potential V_1 to a region of higher potential V_2. Then

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no change TAKES place in velocity component parallel to interface of TWO regions.
direction of its motion remains unchanged but speed increases
direction of its motion may charge but spped must be decreased
decrease in kinetic energy isproportional to `sqrt(V_2-V_1)`.

Solution :a. As the electron is going from low potential to HIGH potential, its potential energy DECREASES, which results in increase in `KE`. HENCE speed definitely increases. Direction of motion may or may not change depending on the angle at which it enters the other region. If `theta` is zero, them direction of motion remains same.
`vsina=usintheta`, but `v cosagtucostheta`
so, `alttheta, v=u`


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