If the light of wavelength $\lambda$ is incident on metal surface, the ejected fastest electron has speed v. If the wavelength i changed to $\frac{3 \lambda}{4}$, the speed of the fastest emitted electron will be:

Question

$\begin{array}{1 1} (1)\; \text{smaller than $\sqrt{\frac{4}{3}}$ } \\ (2)\; \text{Greater than $\sqrt{\frac{4}{3}}$} \\ (3)\; 2v\\ (4)\; Zero \end{array}$