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.
A. Yes, postcards are part of First-Class Mail InternaÂ­tional service. The price for eligible cards is $0.69 to Canada and Mexico and $0.90 to all other countries (exception: postcards to the Marshall Islands and Micronesia are $0.52). Remember, for postcard rates, cards can be no larger than 4-1/4 by 6 inches.