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Sound Recording Act Of 1971
In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the ''reception'' of such waves and their ''perception'' by the brain. Only acoustic waves that have frequency, frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In air at atmospheric pressure, these represent sound waves with wavelengths of to . Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Different animal species have varying hearing ranges, allowing some to even hear ultrasounds. Definition Sound is defined as "(a) Oscillation in pressure, stress, particle displacement, particle velocity, etc., propagated in a medium with internal forces (e.g., elastic or viscous), or the superposition of such propagated oscillation. (b) Auditory sen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thoth08BigasDrumEvansChalmette
Thoth (from , borrowed from , , the reflex of "[he] is like the ibis") is an ancient Egyptian deity. In art, he was often depicted as a man with the head of an African sacred ibis, ibis or a baboon, animals sacred to him. His feminine counterpart was Seshat, and his wife was Maat. He was the god of the Moon, wisdom, knowledge, writing, hieroglyphs, science, magic, art and judgment. Thoth's chief Egyptian temple, temple was located in the city of Hermopolis ( , Egyptological pronunciation: Khemenu, ). Later known as in Egyptian Arabic, the Temple of Thoth was mostly destroyed before the beginning of the Christian era. Its very large pronaos was still standing in 1826, but was demolished and used as fill for the foundation of a sugar factory by the mid-19th century. Thoth played many vital and prominent roles in Egyptian mythology, such as maintaining the universe, and being one of the two deities (the other being Maat, Ma'at) who stood on either side of Ra, Ra's solar barq ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
