1.

Potassium surface with a work function of 2.30 eV is irradiated with a radiation of frequency 9.5×1014 Hz. Negative potential to be applied to the anode to ensure no electrons reach the anode plate, is,

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Potassium surface with a work function of 2.30 eV is irradiated with a radiation of frequency 9.5×1014 Hz. Negative potential to be applied to the anode to ensure no electrons reach the anode plate, is,



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