1. The nature of light was therefore a longitudinal wave . 2. Mechanical longitudinal waves have been also referred to as " compression waves ". 3. :Longitudinal waves and transverse waves can travel at different velocities in the same medium. 4. Oliver Heaviside criticised Helmholtz's electromagnetic theory because it allowed the existence of longitudinal waves . 5. Moreover, they are longitudinal waves . 6. The theory of Huygens was not accepted, by some, because longitudinal waves cannot show birefringence. 7. It is of a bright, transparent ash color, covered with longitudinal waved and reddish lines. 8. In solids, mechanical waves can take many forms including longitudinal waves , transverse waves and surface waves. 9. Tesla incorrectly believed that X-rays were longitudinal waves , such as those produced in waves in plasmas. 10. He also suggested that the " absence " of longitudinal waves suggested that the aether had negative compressibility.
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