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 from 45 cents to 46 cents, while postcards cost 33 cents to send. The USPS rolled out the pricing changes alongside a new stamp â the Global Forever â which lets people mail one-ounce letters to anywhere in the world for $1.10. Other new services include free tracking for packages and the option of receiving a signature upon delivery for critical mail items, WALA reports.