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.
If you pass light through glass, its speed decreases and its frequency remains constant. This means the wavelength must decrease while the frequency stays the same. With waves it tends to be frequency that is constant. You need to think more about how, in this case, wavelength varies with speed.(Original post by muh123). I need a proper explanation to why it happens, I just don't understand why.t doesn't. Apart from light in a vacuum, the speed of a wave in a medium will vary with frequency or wavelength. It's called dispersion. Apart from light in glass, which is well known, the speed of sound in gases in some cases will increase with frequency. At higher frequencies in CO2 for example.