An electron with kinetic energy K1 enters between parallel plates of a capacitor at an angle 'α' with the plates. It leaves the plates at angle 'β' with kinetic energy K2. Then the ratio of kinetic energies K1 ∶ K2 will be:
1
\(\frac{{\cos \beta }}{{\cos \alpha }}\)
2
\(\frac{{\cos \beta }}{{\sin \alpha }}\)
3
\(\frac{{{{\sin }^2}\beta }}{{{{\cos }^2}\alpha }}\)
4
\(\frac{{{{\cos }^2}\beta }}{{{{\cos }^2}\alpha }}\)
5
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