Sound waves, pressure waves and primary waves (a type of seismic wave produced by earthquakes), are longitudinal waves. Longitudinal waves can also be made by pushing a spring forwards and ...

Sound Waves. Part of Science Physics. ... Ultrasound waves are longitudinal waves just like sound waves, and they cannot pass through a vacuum. Ultrasound waves have a frequency above 20 000 Hz, ...

ALL seismic work indicates that at least part of the core of the earth is liquid, since no transverse waves have ever been observed to pass through it. It has been suggested, however, that the ...