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1what's the frequency that human ears can hear?20 - 20 000 Hz
2how many hz is an ultra sound20 000 hz plus
3Ultra sound partially reflects at the boundary between.......2 different densities
4Eg of things detected in ultra soundKIDNEY STONES
they have a different density compared to the kidney and so a different reflected wave is sent back to the transducer and so the kidney stone becomes known
5Why is ultra sound safer than x-rayunlike x-rays ultra sounds don't produce mutations or a ionise and so they are less of a risk. No risk of getting cancer
6Equation needed for ultra soundDISTANCE = SPEED x TIME
7What to remember if the question asks for the depthDivide by 2 (unless told otherwise) as the equation gives result for the time/distance/speed for the wave to go to the target and back to where it came from
8MEDICAL USES OF ULTRA SOUNDIMAGING
unlike x-rays, ultra sounds are not ionising and don't mutate but the images produced are not of a high resolution
9MEDICAL USES OF ULTRA SOUNDanalysing the speed of blood flow
10MEDICAL USES OF ULTRA SOUNDhigh intensity ultra sounds can destroy kidney stones