For the wavelength \(=150 nm\) \(=150 \times 10^{-9} m , C =3 \times 10^{8} m / s\)
\(E=h f\)
\(=\frac{h c}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^{-8}}{150 \times 10^{-19}}\)
we convert this to \(eV\)
\(1 eV =1.6 \times 10-19 J\)
\(x=1.32 \times 10^{-18} J\)
\(=\frac{1.32 \times 10^{-18}}{1.6 \times 10^{-19}}=8.25 eV\)
Since \(h f=8.25 eV\) and this is less than \(19 eV\) the work function, (Wo), no electron is emitted