1. a word or phrase supposed to have magic power; incantation. 2. a state or period of enchantment: living under a spell. 3. any dominating or irresistible influence; fascination: the spell of fine music.
IF a wave moving at a constant speed were to have it's wavelength doubled (Wavelength x 2), then the frequency of the wave would be half of what it originally was (Frequency / â¦ 2). 6 people found this useful. Al Cohen.
As a wave enters a medium in which the speed of light decreases, the frequency remains constant, but the wavelength. changes. Use equation 25-4 to write a ratio of the new wavelength in terms of the initial wavelength. 1. (a) The wavelength of an electromagnetic wave is directly proportional to its speed.