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be caused by sound waves that vibrate at times a second . this will be middle c on the piano . not all musical instruments make notes of a certain pitch. many percussion instruments like drums , triangles and cymbals are instruments used for rhythms . they do not play tunes because they have no definite...
pa) rispettivamente exposure limit values the exposure limit values and exposure action values in respect of the daily noise exposure levels and peak sound pressure are fixed at: a) exposure limit values: lex, h = b(a) e ppeak = pa ( db(a) re. ?...