The Pennsylvanian, for its entire Pittsburgh to Philadelphia run, carried 212,006 passengers, up 2.2 percent over the prior year. Nearly 70 percent of that ridership boarded or disembarked west of Harrisburg, according to Amtrak. think it would be worth it for Amtrak and PennDOT to see if more schedule diversity might make it a more popular travel option, Ms. Katchmar says. â¢ Go to post-gazette.com for a slideshow of photos taken aboard the Pennsylvanian and a video report. Jon Schmitz: jschmitz@post-gazette.com or 412-263-1868.
How light travels. Light travels as waves. These are transverse waves, like the ripples in a tank of water. The direction of vibration in the waves is at 90Â° to the direction that the light travels. Light travels in straight lines, so if you have to represent a ray of light in a drawing, always use a ruler. Unlike sound waves, light waves can travel through a vacuum (empty space).
Sound breaks the light barrier. Jan 12, 2007 2007-01-12T09:53:50+0000. Nothing can travel faster than lightâ¦ except for sound. This is the claim of some US physicists, who say they have designed an unusual waveguide to make sound move at superluminal speeds (Appl. Phys. Lett. 90 014102). Sound often comprises numerous superimposed waves of various wavelengths.