Variation of stopping potential \( V_{0} \) with frequency \( v \) ...

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Variation of stopping potential \( V_{0} \) with frequency \( v \) of incident radiation for photosensitive materials \( A \) and \( B \) are shown.
From graph we conclude that
I. maximum kinetic energy of photoelectrons varies linearly with frequency.
II. a frequency lower than a certain frequency photoemission is not possible.
III. density of metal \( A \) is more than that of \( B \).
IV. metal \( A \) contains more electrons than that of \( B \).
(a) I and II
(b) I and IV
(c) III and IV
(d) II and III
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