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.
USPS raises price of stamps. The U.S. Postal service is now charging Americans a penny more for stamps and postcard mailings. The price of a first-class stamp for domestic mail rose Sunday [1/27/2012] from 45 cents to 46 cents, while postcards cost 33 cents to send..S. Postal Service lifts stamp price by 1 cent. The cash-strapped U.S. Postal Service announced on Tuesday a one-cent increase in the cost of mailing a letter, starting in January. The new prices lift the cost of a first-class stamp to 45 cents starting on January 22, 2012, the first increase in more than two years.