One way to categorize waves is to say that there are longitudinal and transverse waves. In a transverse wave, particles of the medium are displaced in a direction perpendicular to the direction of energy transport. In a longitudinal wave, particles of the medium are displaced in a direction parallel to energy transport.
Seven plans allowed normal retirement within these ages. Six of them required at least 30 years of service for normal retirement. Only two of the plans continue to allow normal retirement within these ages. Both now require a minimum age of 57 and at least 30 years of service. For most plans the minimum age requirement increased to the range of age 60 to age 62. Age 60.
For persons who became members of TRS prior to September 1, 2007, had at least five years of service credit on August 31, 2014, and maintain membership until retirement, the following eligibility requirements must be met to qualify for normal age retirement: Age 65 with five or more years of service credit, or. 2  At least age 62, meet the Rule of 80 (combined age and years of service credit equal at least 80), and have at least five years of service credit.