(a).      A hydrogen atom has its electron in the n = 1 stat…

(a).      A hydrogen atom has its electron in the n = 1 state. (i).         How much energy would be absorbed by the atom for the electron to end up in the n = 4 state?            (2.5 points) (ii).       What is the frequency of the photon that could produce this result?                                             (1.5 points) (b).        List any three applications of lasers.                                                                                              (3.0 points)

(a).  21084Po undergoes alpha decay. Write down the complete…

(a).  21084Po undergoes alpha decay. Write down the complete decay equation and identify the daughter nuclide.              (2.5 points) (b).         Uranium-238 undergoes alpha decay as follows:    23892 U→ 42He +  23490 Th         Mass    23892 U  = 238.050786 u,     Mass    42 He  = 4.002603 u and  mass  223490 Th =234.043583 u          Calculate the binding energy (to four significant figures) for this nuclear reaction.                             (2.5 points)                     u = 1.66 x 10-27 kg            c= 3.0 x 10 8 m/s       eV = 1.6 x 10 -19 J               (c).     Iodine-131, a beta emitter, has a half-life of 8 days. A 60-gram sample of initially pure iodine-131 is stored for 80 days. How much iodine-131 remains in            the sample afterward?                               (2.5 points)