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The de Broglie wavelength \( (\lambda) \) associated with a photoelectron varies with the frequency (v) of hte incident radiation as [ \( \mathrm{v}_{0} \) is threshold frequency]:
(1) \( \lambda \propto \frac{1}{\left(v-v_{0}\right)} \)
(2) \( \lambda \propto \frac{1}{\left(v-v_{0}\right)^{\frac{1}{2}}} \)
(3) \( \lambda \propto \frac{1}{\left(v-v_{0}\right)} \)
(4) \( \lambda \propto \frac{1}{\left(v-v_{0}\right)^{\frac{1}{2}}} \)
 
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