Relationship between λ and max kinetic energy

[desmond iking]

Homework Statement

When lights falls on metal suface , electrons are emitted if the wavelength of light is less than or equal to λ , .If lights of 0.5λ is used , then maximum kinetic energy of electrons is E . if lights of 0.25λ is used , what's the maximum kinetic energy of the electron emitted?
the ans is 3E... why?

Homework Equations

The Attempt at a Solution

since E is inversely propotional to λ , so my ans is 2E ...[/B]

 

[NascentOxygen]

3E is correct. Show your working in full.

Note carefully that E is defined as max KE at a particular λ .