In I/GCSE Physics, it belongs to core physic (Topic 4). The details of ultrasound will be discussed in the following.

• Sound waves above 20 kHz is called Ultrasound which humans ears cannot detect.
• Ultrasound waves are partially reflected at a boundary between media.
• Partial reflection is when a wave is passed from one medium to another, some of the wave is reflected off the boundary between the two media and some is transmitted and refracted.
• You can point a pulse of ultrasound at an object and if there are boundaries between one substance and another, the ultrasound gets reflected back.

• It is used to break down kidney stones which is then passed through urine and for body scans to detect gal stone, tumors or pregnancy.
• It is used for sonar detection.

• When ultrasound is directed at a human body, the surface of different tissues inside the body due to partly reflect the ultrasound.
• The detector will receive the ultrasound echoes at different time depending on how deep inside the body the tissue surface are.
• The detector produces electrical signals which are sent to a computer and then displayed on a screen as a picture.
• Ultrasound can be used safely to see an image of a developing baby inside the uterus during pregnancy.

That's all!

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