Um som num determinado local tem uma velocidade de 340 m/s. um altifalante ao vibrar a membrana nesse local emite 1250 pulsos por segundo. Determina a sua frequência de vibração da membrana do altifalante

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.

the answer is the index of refraction of the second medium is higher. i just took the test.