Origins of the Domino Theory. In September 1945, the Vietnamese nationalist leader Ho Chi Minh proclaimed Vietnamâs independence from France, beginning a war that pitted Hoâs communist-led Viet Minh regime in Hanoi (North Vietnam) against a French-backed regime in Saigon (South Vietnam).
The human range is commonly given as 20 to 20,000 Hz, though there is considerable variation between individuals, especially at high frequencies, and a gradual loss of sensitivity to higher frequencies with age is considered normal.
Ear cannot respond to all frequencies in an unbiased manner. Audible range of human being is commonly quoted as from 20 Hz to 20,000 Hz, which in fact will vary with age, health, past exposure to noises, and so forth.Ear also acts like a filter and will favour certain frequencies over the others.udible range of human being is commonly quoted as from 20 Hz to 20,000 Hz, which in fact will vary with age, health, past exposure to noises, and so forth.