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.
Sound is a wave that travels through a medium and carries energy from one place to another. A sound wave consists of a series of orderly oscillations of particles within the medium. These oscillations produce regions of compressions and rarefaction (high and low pressures) throughout the medium. Ultrasound is defined as a sound wave with a frequency above 20,000 cycles per second or hertz (Hz).