The full range of wavelengths for light is called the electromagnetic spectrum.. The image and table below show which wavelength ranges in the electromagnetic spectrum correspond to which types of light. Constants. 1  Home. 2  Physics Tools. 3  Contact Us. 4  Forums.
Social Security benefits account for 50 percent or more of retirement income for three out of five beneficiaries receiving Social Security benefits who are age 65 or older. Nearly one out of four received all of their income from Social Security in 2012.
Raising the Retirement. Age for Social Security. When the Social Security program began paying monthly benefits in 1940, workers could receive unreduced. retired-worker benefits beginning at age 65. This age is known as the Normal Retirement Age (NRA). The. law was changed in 1983 to increase the NRA gradually beginning in 2000, from age 65 to age 67, recog-.