The radioactive nuclide 2964Cu  decays by beta emission to 3064Zn  or by positron emission to Ni 2864 . The maximum kinetic energy of the beta particles is 0.58 MeV, and that of the positrons is 0.65 MeV. The mass of the neutral 2964Cu  atom is 63.92976 u.(a) Calculate the mass, in atomic mass units, of the neutral 3064Zn  atom. (b) Calculate the mass, in atomic mass units, of the neutral Ni 2864 atom.

β-decay of 3H (tritium), a manufactured isotope of hydrogen used in some digital watch displays, and manufactured primarily for use in hydrogen bombs.

(a) If exactly 1.00 μg of 226Ra was used to paint the glow-in-the-dark dial of a wristwatch made in 1914, how radioactive is the watch in 1955? Express your answer in becquerels (Bq). The half-life of 226Ra is 1.60 ×× 103 years. (b) Express your answer from above in microcuries (μCi).