Sound

Sound is vibration transmitted in medium (liquid, gas or solid) and can be percepted by human and animals within certain limits by special organs. Main sound characterisitics are frequency and amplitude.

Person can perceive sound in diapason from 16 Hz to 20 000 Hz. Vibration with frequency lower than 16 Hz is infrasound. Sound within limits from 20 000 Hz to 1 GHz is called ultrasound and which is higher than 1 GHz is hypersound.

Dogs can percept vibrations higher than 20 kHz. Some species of butterflies have mechanoreceptors which accept vibrations and are located on thorax or hind body.

Speed of sound is determined by medium. For example, the speed sound in gases depends on temperature. In 20 C air it is about 1230 km/h. In fresh water at 20 C speed sound is approximately 5335 km/h. In steel it can be 21460 km/h. .

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March 15, 2009

Fultonsphoto

Sounds good to me :0)

March 15, 2009

Olyashevchenko

Creativei, every artist discovers world like a child - he or she likes to ask questions and always wonders how things work. For me laws of nature are interesting and important to know so then I can use them as guidlines or break them in my works.

March 15, 2009

Creativei

Hi Olga, for moment I was back in my school days, I rem how my Physics teacher used explain all this and how we boys used to make fun of him. Well DT is growing big time, we can learn lots of things here in DT, including Science.

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