A surface is irradiated with ultra violet radiation of wavelength $$0.2\mu m$$. If the maximum velocity of electron liberated from the surface is $$8.8\times 10^{5} m/s$$, then the work function of the surface is

$$4\ eV$$

$$3\ eV$$

$$5\ eV$$

$$6\ eV$$

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Correct option is B. $$4\ eV$$

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