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 :

Question

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 :

${{{{\cos }^2}\beta } \over {{{\cos }^2}\alpha }}$

${{\cos \beta } \over {\cos \alpha }}$

${{{{\sin }^2}\beta } \over {{{\cos }^2}\alpha }}$

${{\cos \beta } \over {\sin \alpha }}$

Solution

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