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.
Description. How sound waves work and why nothing can be heard in a vacuum. Sound is created through vibration. This is illustrated with reference to a hand bell, a humming bird and buzzing insects. Sounds cannot be heard in a vacuum, as waves need air to carry them.