The wave function of a metal is 8.0 x \(10^{-19}\)J. Calculate the wavelength of its threshold frequency. (Speed of light in a vacuum = 3 x \(10^8ms^{-1}, Planck's constant = 6.6 \times 10^{-34}\)Js)
A. 0.8 x \(10^{-7}\)m B. 1 x \(10^{-7}\)m C. 2.3 x \(10^{-7}\)m D. 3.8 x \(10^{-7}\)m E. 12.4 x \(10^{-7}\)m
