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.
First-Class MailÂ® is a fast, affordable way to send envelopes and lightweight packages. Itâs perfect for business and personal correspondence, cards, brochures, and lightweight merchandise. The ForeverÂ® Stamp price is $0.49; First-Class Mail Postcard Stamp price is $0.35.