Monochromatic radiation is incident on a metal plate in a vacuum, causing photoelectrons to be emitted. The wavelength of the incident radiation is now decreased, whilst keeping the total power incident on the metal surface constant. The frequency of the radiation remains above the threshold frequency of the metal.

Explain the effect of this change on:

• the maximum kinetic energy, $E_{k(max)}$, of the emitted photoelectrons,
• the photoelectric current, $I$.