• Subject:

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• Topic:

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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200nm falls on it, must be

(a) 2.4 V

(b) $-$1.2 V

(c) $-$2.4 V

(d) 1.2 V

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