19780Hg decays to 19779Au through electron capture with a decay constant of 0.257 per day. (a) What other particle or particles are emitted in the decay ? (b) Assume that the electron is captured from the K shell . Use Meseley,s law √v=a(Z−b) with a = 4.95 ×107 s−1/2and b = 1 to find the wavelength of the Kα X-ray emitted following the electron capture.