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... continue reading
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