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.
  When the frequency is decreased, the wavelength is increased.   Wavelength lambda and frequency f are connected by the wave speed c of the medium.   c can be air = â¦ 343 m/s at 20 degrees celsius or water at 0 dgrees = 1450 m/s.  c can be light waves or electromagnetic waves = 299 792 458 m/s.  For example, we will say â¦ that the standard wavelength is 5m.   F = 3.0 x 108 / 5   = 60,000,000 hertz    Say if we increased the wavelength to 6m:   F = 3.0 x 108 / 6   = 50,000,000 hertz     As you can see, if we increase the wavelength, the frequency decreases.