Doctors use ultrasound to look at a baby before birth.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Doctors use ultrasound to look at a baby before birth. Give two reasons why ultrasound is useful for this.
Need a reminder? The key ideaShow
Loudness depends on the amplitude, pitch on the frequency, and quality on the mixture of frequencies. People hear about to : below is infrasound, above is ultrasound.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Its short waves travel in a narrow beam and reflect from the boundaries between organs, so the echoes can be built into a picture.
Step 2. It is safe: it does not harm the baby the way X-rays might.
Answer: clear pictures from echoes, and it is safe.
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