Sound amplification by stimulated emission of radiation mechanism and an active medium. The pumping procedure can be induced for example by an alternating electric field or with some mechanical vibrations of resonators, followed by acoustic amplification in the active medium. The fact that a SASER operates on principles remarkably similar to a laser, can lead to an easier way of understanding the relevant operation circumstances. Instead of a feedback-built potent wave of electromagnetic radiation, a SASER delivers a potent sound wave. Some methods for sound amplification of GHz-THz have been proposed so far. Some have been explored only theoretically and others have been explored in non-coherent experiments.
A Sound of Thunder changes in the future is a representation of the butterfly effect, and used as an example of how to consider chaos theory and the physics of time travel. A Sound of Thunder "A Sound of Thunder" is a science fiction short story by Ray Bradbury, first published in "Collier's" magazine in the June 28, 1952, issue and Bradbury's collection "The Golden Apples of the Sun" in 1953. In the year 2055, time travel has become a practical reality, and the company Time Safari Inc. offers wealthy adventurers the chance to travel back in time to hunt extinct species such as