What is a Jewish baby naming ceremony? This is a brief ceremony during which the baby is given his or her Hebrew name. The chosen Hebrew name could be a name that sounds like the baby's secular/English name, or one that begins with the same sound as the baby's secular/English name.
For  radio waves and light waves  â scroll down â. Conversion: frequency f to wavelength Î» and wavelength to frequency. The speed of propagation c can be the speed of sound *or* the speed of light and radio waves. Sound waves are waves which propagate vibrations of air molecules.
In a vacuum, there is no air. Sounds cannot trasvel in a vacuum because they have no medium in which they can travel through. Sound travel through matter, trough the interaction of the electrical force between particles. Vacuum is per definition empty of matter, so there is nothing for a sound wave to propagate trough.