Microsoft encarta encyclopedia deluxe 2004

#Microsoft encarta encyclopedia deluxe 2004 full#

Microsoft Encarta encyclopedia deluxe 2001 _ Encarta encyclopedia deluxe 2001. Subject: Encyclopedias and dictionaries - Interactive multimedia% Electronic encyclopedias. Bats, whales, porpoises, and dolphins use ultrasound for navigation.Webster's millennium 2004 encyclopedia _ 2004 encyclopedia _ Webster's 2004 encyclopedia. Ultrasound, on the other hand, is above the range of the human ear. In fact, recent research indicates that elephants also communicate with infrasound. It is so low that it may be detected by a creature with big ears, such as an Elephant. Any frequency that is below the human range is known as infrasound. Some low frequencies like a heart beat of 1 or 2В Hz can not be heard, just like sonar sounds produced by dolphins which are too high. The human ear is capable of hearing many of the sounds produced in nature, but certainly not all.

The frequency range of a young person is about 20 to 20,000 hertz. The frequency of a sound wave determines its tone and pitch. The hertz,В Hz, is the derived SI unit of frequency. Frequency is the number of cycles, or complete vibration experienced at each point per unit.

What is sound and frequency? Sound is a longitudinal mechanical wave of any frequency. 'The normal range of hearing for a healthy young person is 20 to 20,000 Hz hearing deteriorates with age and with exposure to unsafe volume levels.' Originally appeared in the March/April 1989 issue of Car Stereo Review magazine. to about 20,000 cps (although an individual might have a considerably smaller range).' 'The human ear can hear frequencies ranging from about 20 cps. Basic Acoustics for Electronic Musicians. 'The maximum range of human hearing includes sound frequencies from 15 to about 18,000 waves,or cycles, per second.' 'The Human Ear.' Encarta Encyclopedia Deluxe 2004. 'The human ear has receptors that can detect sound frequencies raging from 16 vibrations to20,000 vibrations per second.' This means that women will have the ability to hear notes of higher pitch than men of the same age do.Д¬hristopher D'Ambrose - 2003 BibliographicВ Entry Also, the hearing range for men worsens more quickly than the hearing range for women. The highest frequency that a normal middle-aged adult can hear is only 12-14В kilohertz. People lose the ability to hear sounds of high frequency as they get older. The hearing range of humans gets worse with age. The range of hearing for a healthy young person is 20 to 20,000В hertz. Humans cannot hear sounds of every frequency. A sound with a high frequency will have a high pitch, such as a dog whistle. A sound with a low frequency will have a low pitch, such as a human's heartbeat. OneВ hertz is equal to one vibration per second. Frequency varies for each sound and is measured inВ hertz. The number of vibrations that are produced per second is called frequency. Sound cannot be seen, but it can be felt by vibrations. Sound travels in waves through the air, the ground, and various other substances. The ears help the body to pick up sound waves and vibrations.

Hearing is one of the five senses of the body. The ear is an amazing body part because it enables humans and animals to hear what goes on around them.

#Microsoft encarta encyclopedia deluxe 2004 full#

'The full range of human hearing extends from 20 to 20,000В hertz.' 'The human ear can hear vibrations ranging from 15 or 16 a second to 20,000 a second.'Д¬aldarelli, David D. 'Body, Human.' The New Book of Knowledge. 'The general range of hearing for young people is 20В Hz to 20В kHz.' National Physical Laboratory (NPL), 2003. 'The maximum range of human hearing includes sound frequencies from about 15 to about 18,000 waves, or cycles, per second.'ДЄcoustics. 'Experiments have shown that a healthy young person hears all sound frequencies from approximately 20 to 20,000В hertz.'