The conversion efficiency (e) of a photoelectric material is the fraction of light energy incident on the surface of the material that is converted into electric energy. A physicist constructed a photoelectric device to determine the individual conversion efficiencies of Materials A and B. For a material to be tested, a metal grid was sandwiched between two thin layers of that material. The grid was used to collect the electrons generated by the device. The photoelectric material had a coating that maximized the absorption of light at certain frequencies. Monochromatic light of varying wavelengths was shone on the device, and the conversion efficiency was determined at each wavelength. The results are given in the Table below. The conversion efficiency of Material B is 0.42 at a frequency of