| # | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| ||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||
| | RayAt higher audio frequencies, sound may be considered to travel in straight lines, in a direction normal to the wave front.  
| | ||||
| Science & Engineering Encyclopaedia Version 2.4 © 2001-2010 Dirac Delta Consultants Limited | ||||||