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.
The wave's frequency does not change, however. Instead, as the wave's speed increases and decreases, its wavelength also increases and decreases accordingly. Waves behave in other predictable ways when the medium through which they travel changes.