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.
Audible Sound. Usually sound is used to mean sound which can be perceived by the human ear, i.e., sound refers to audible sound unless otherwise classified. A reasonably standard definition of audible sound is that it is a pressure wave with frequency between 20 Hz and 20,000 Hz and with an intensity above the standard threshold of hearing.