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do Light of wavelength 0.6um from a sodium lamp falls on a photo cell and causes the emission of photoelectrons for which the stopping potential is 0.5V with light of wavelength 0.4um from a sodium lamp, the stopping potential is 1.5V, with this data the value of - is: е a. 4x10-19 V.S 4.4x10-15 vs b.0.25x10-15 V.s d. 4x10-8 V.s

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