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.
this report discusses increases in age and service requirements for normal retirement that state governments enacted from 2009 through 2011 it includes changes in 30 plans for general state employees and teachers in 25 states and 16 plans for public safety employees in 13 statesnly five plans provide for normal retirement at 60 service requirements range from 8 to 30 years age requirements generally moved to the range of age 60 to age 62and two plans increased the minimum age of eligibility to 67