If Light of Wavelength 320 Nm Causes a 2

If light of wavelength 320 nm causes a 2.1 eV photon to be emitted from a metal surface,which of the following statements holds?

A) The work function must be greater than 2.1 eV.
B) The work function must be less than 1.8 eV.
C) The work function must be 3.9 eV.
D) The cut-off wavelength for photo emission is less than 320 nm.
E) The energy of a 320 nm photon must be 2.1 eV.

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