Achild on a playground swing makes a complete to-and-fro swing each two seconds. the frequency of the swing is

Which of the following statements is true about women and minorities in early psychology? a. in the early 20th century, numerous graduate schools recruited women and minorities to study psychology. b. opportunities in higher education were limited for women and minorities in the early 20th century due to discrimination. c. despite some obstacles, there were numerous employment opportunities for women and minorities. d. women and minorities were often selected to do academic research in an effort to make the field more diverse.

Which two particles are found in the center of an atom

If anyone who can me with this hw? i would really appreciate it