There are literally hundreds, if not thousands of conditions that an ultrasound can help diagnose. If you are looking for something more specific, I will need more information to answer your question.
yes when you get an ULTRASOUND when your pregnant it use ultrasound waves to show the image.
Is there any signs on an ultrasound scane to show the sex of baby
No
metal objects show up on a ultrasound scan because when it hits a new media, It will reflect and slow down, so compressed objects will show easily on ultrasound scans.
can a 5 week fetus show on an ultrasound
You could see a heartbeat if they do a transvaginal ultrasound.
Ultrasound can visualize fetus inside with no errors.
Tell him or show him a picture of the ultrasound or show him baby clothing.
You can't from the outside but an ultrasound can show this
No, by that stage in a pregnancy, the baby would be ready to be delievered and would definitely show up on an ultrasound.
heart,head
ultrasound is more accurate. Measurments of the fetus are made during ultasound that give a more accurate gestational age