a woman has having ultrasound scan. Ultra sound travels at 1500ms inside the body.The ultrasound transmitter sends out a pulse of ultrasound and it is reflected from a surface 7.5cm away.How long before the echo is recieved.
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Ultrasound is sound with a frequency greater than 20,000 Hz. Humans cannot hear ultrasound but many other animals can, such as mice, dogs and porpoises.
Ultrasound is useful because it has a short wavelength so it can be focussed into a beam.
Uses of ultrasound - Higher
Ultrasound scans are used to form images of things inside the body, such as an unborn baby. This is due to the fact that ultrasound can be transmitted through soft tissue, but is mostly reflected when it comes into contact with more dense material such as bone. Any ultrasound that is not reflected will be absorbed by the body. Doctors also use ultrasound to monitor blood flow and destroy kidney stones.
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