In an effort to allow for this discrepancy, many baroque ensembles adjust their tuning to the repertoire being performed: aâ= 415hz for late baroque music, aâ=392hz for French music, aâ=440hz for early Italian music and aâ=430hz for classical repertoire.
Ultrasound uses the size of the fetus to determine the gestational age (the time elapsed since the the first day of the last menstrual period). The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age.Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age [24].ltrasound uses the size of the fetus to determine the gestational age (the time elapsed since the the first day of the last menstrual period). The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age.
The earliest an ultrasound can possibly determine the gender of a  fetus is 12 weeks. Most doctors won't attempt to determine the  gender until 16-20 weeks. Unlike amniocent â¦ esis, ultrasound  genderizing isn't an exact science.Depending on the way the baby  lays, it can be difficult to see the genitals.ost doctors won't attempt to determine the  gender until 16-20 weeks. Unlike amniocent â¦ esis, ultrasound  genderizing isn't an exact science. Depending on the way the baby  lays, it can be difficult to see the genitals.