(a).  Balance the following nuclear reaction and identify th…

(a).  Balance the following nuclear reaction and identify the missing radionuclide.                                                                                                         23290Th undergoes alpha decay. Write the decay equation and identify the daughter nucleus?          (2.0 points)                                                                                                                               (b). The barium isotope 131 Ba has a half-life of 12 days. A 250-gram sample of  131 Ba is prepared . What is the mass of 131 Ba after        3.5 day?                                                                                                           (2.5 points)  

(a).         A 632 nm light enters a liquid from air at an a…

(a).         A 632 nm light enters a liquid from air at an angle of 34° with respect to the normal and is refracted into the liquid at an angle of 28° with respect to the normal.  (i).          What is the angle between the incident rays and the reflected ray?                                                  (1.0 point) (ii).         What is the index of refraction of the liquid?                                                                                       (1.5 points) (iii).       What is the speed of the light in the liquid?                                                                                          (1.5 points) (b).         A 2.0 m tall object is 40 cm in front of a converging lens that has a 20 cm focal length. Determine the position of the image and describe the image.                                                                                                                                                                                                                      (4.0 points)