The photoelectric threshold for a certain metal surface is $330 \mathrm{\AA }$. What is the maximum kinetic energy of photoelectron released, if any, by a radiation of wavelength $1100 \mathrm{\AA }$.

The wavelength of incident radiation is

 $\mathrm{\lambda }=1100 \stackrel{0}{\mathrm{A}}$

Threshold wavelength is

 ${\mathrm{\lambda }}_0=330 \stackrel{0}{\mathrm{A}}$

To occur photoelectric phenomenon, incident radiation should have wavelength less than or equal to threshold wavelength.

Since $\mathrm{\lambda }>{\mathrm{\lambda }}_0$, no photo electron is emitted.