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Light of wavelength 0.6 mum from a sodiu...

Light of wavelength `0.6 mum `from a sodium lamp falls on a photocell and causes the emission of photoelectrons for which the stopping potential is 0.5 V. With wavelength `0.4 mum` from a sodium lamp, the stopping potential is 1.5 V. With this data , the value of h/e is

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