Experimentally, the electron affinity of an element can be determined by using a laser light to ionize

Question:

Experimentally, the electron affinity of an element can be determined by using a laser light to ionize the anion of the element in the gas phase:
X-(g) + hv → X(g) + e-
Referring to Table 8.3, calculate the photon wavelength (in nanometers) corresponding to the electron affinity for chlorine. In what region of the electromagnetic spectrum does this wavelength fall?