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ACTIVITY To realize the sound wave, the human eardrum that he needs at least physical intensity corresponds to 10 w / m (power per area), the so-called hearing threshold and a maximum of up to 1 w / m for pain threshold. The greatness noise level follows a logarithmic scale, defined by: C = log 10 Where I is the sound intensity and I is a reference level set by international convention, which is used as the threshold of audibility. The most commonly used unit is the decibel (dB) in honor of Alexander Graham Bell (1847-1922), who invented the telephone. In decibels (dB), as is the threshold of hearing? And the pain threshold (dB)? The sounds are very intense unpleasant to the human ear. Sounds with intensities above 130 dB cause soreness and sounds above 160 dB can rupture the eardrum and cause deafness. In the end of year festivities or when a title is won by our favorite team is common some people burst firecrackers, as a form of celebration. Have you noticed what happens to the dogs during the deafening burst of fireworks? Why do they bother much with the noise? What is the sound frequency of the dogs? Did you know that some animals are able to perceive ultrasound, which is a sound with a frequency greater than that which a human being can perceive? For this reason, it is common to use dogs to detect the presence of intruders, they can not hear sounds detected by the human ear. SEARCH Search on the sound frequencies of dogs and other animals. The ear has a characteristic that does not respond to sound stimuli in a linear fashion. If a sound source doubles the output power, the ear does not perceive that the increase was twice that. Mathematics, Music and Earthquake, What's In Common?
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AKTIVNOST Da bi se ostvarila zvučni val, čovjeka bubnjić zahtijeva da ima minimalnu fizičku intenzitet odgovara 10 W / m (snaga po području), tzv ročište prag, a najviše do 1 W / m za praga boli. Razina buke veličinu slijedi logaritamsku skalu, koje su definirane: C = 10 log Ja sam Gdje sam je intenzitet zvuka i ja je referentna razina podesiti prema međunarodnoj konvenciji, koja se koristi kao prag čujnosti. Najčešće korišteni jedinica decibel (dB) u čast Alexander Graham Bell (1847-1922), koji je izumio telefon. U decibelima (dB), što je prag čujnosti? I prag boli (dB)? Zvukovi su vrlo intenzivna neugodna za ljudsko uho. Zvuci sa intenzitetima iznad 130 dB uzrokovati bol i zvukove iznad 160 dB mogu puknuti bubnjić i uzrokovati gluhoću. Na kraju godine svečanosti ili kada je osvojio naslov od strane našeg omiljenog tima je zajednička neki ljudi praska petarde, kao oblik slavlja. Jeste li primjetili što se događa s psima tijekom zaglušujući prasak vatrometa? Zašto se mučiti s puno buke? Što je zvuk frekvencije od pasa? Jeste li znali da neke životinje mogu percipirati ultrazvuk, što je zvuk čija je frekvencija veća od onoga što ljudsko biće može percipirati? Iz tog razloga, to je uobičajeno koristiti psi za otkrivanje prisutnosti uljeza, oni ne mogu čuti zvukove otkrivene u ljudskom uhu. TRAŽI Traži na frekvencije zvuka pasa i drugih životinja. Uho ima obilježje koje ne reagiraju na podražaje zvuči u linearno. Ako izvor zvuka udvostručuje izlazne snage, uho ne vidim da je porast bio dvostruko. Matematika, Glazba i potresa, Što je zajedničko?