Radiation of wavelength $\lambda$, is incident on a photocell. The fastest emitted electron has speed $v$. If the wavelength is changed to $\frac{3λ}{4}$ , the speed of the fastest emitted electron will be :

Question

( A ) $> v (\frac{4}{3})^{1/2}$
( B ) $< v (\frac{4}{3})^{1/2}$
( C ) $= v (\frac{4}{3})^{1/2}$
( D ) $= v (\frac{3}{4})^{1/2}$