If light of wavelength `lambda_(1)` is allowed to fall on a metal , then kinetic energy of photoelectrons emitted is `E_(1)`. If wavelength of light changes to `lambda_(2)` then kinetic energy of electrons changes to `E_(2)`. Then work function of the metal is
A. `(E_(1)E_(2)(lambda_(1)-lambda_(2)))/(lambda_(1)lambda_(2))`
B. `(E_(1)lambda_(1)-E_(2)lambda_(2))/(lambda_(1)-lambda_(2))`
C. `(E_(1)lambda_(1)-E_(2)lambda_(2))/(lambda_(2)-lambda_(1))`
D. `(lambda_(1)lambda_(2)E_(1)E_(2))/(lambda_(2)-lambda_(1))`
