âJoseph Ally, Shingle Springs, CA. A. Avocado oil is a fine choice for a healthful vegetable oil (itâs high in monounsaturated fats), but itâs probably not readily available in most supermarkets. In fact, most liquid vegetable oils are healthy choices, but someâprimarily olive and canolaâare healthier than others. Check our report on the extra-virgin olive oils, in which we found that some oils don't make the grade. And find out how to save at the supermarket on oils and other food items.
Light moves even faster AND has shorter wavelengths. These combine to give light extremely high frequencies. Red light has a wavelength of about 682 nanometers. Its frequency is around 440 terahertz.That's 440,000,000,000,000 hertz.ight moves even faster AND has shorter wavelengths. These combine to give light extremely high frequencies. Red light has a wavelength of about 682 nanometers. Its frequency is around 440 terahertz.
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.