The red wavelengths of light are the longer wavelengths and the violet wavelengths of light are the shorter wavelengths. Between red and violet, there is a continuous range or spectrum of wavelengths.
The USPS also includes that a large postcard is 49 cents to mail. The maximum size for this postcard is 11 1/2 inches long, 6 1/8 inches high and 1/4 inch thick. This is the same rate to mail a First Class 1 ounce letter domestically. The rates for postage increased as of January 2014.
Postage Rates to Increase in January. The US Postal Service has announced that as of January 27, 2013, the cost to mail first class letters, postcards and packages within the US will go up. The cost to mail a first class letter will be 46 cents, while the cost to mail a postcard will be 33 cents, an increase of 1 cent for each. This is the third increase for postcard postage in less than two years; in April 2011, the USPS boosted the postcard stamp price from 28 cents to 29 cents, and from 29 cents to 32 cents in January 2012.