In a photoemissive cell with exciting wavelength \( \lambda \), the fastest electron has speed \...

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In a photoemissive cell with exciting wavelength \( \lambda \), the fastest electron has speed \( v \). If the exciting wavelength is changed to \( 3 \lambda / 4 \), the speed of the fastest emitted electron will be
(a) \( v(3 / 4)^{1 / 2} \)
(b) \( v(4 / 3)^{1 / 2} \)
(c) Less than \( v(4 / 3)^{1 / 2} \)
(d) Greater than \( v(4 / 3)^{1 / 2} \)
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