Concerning trans-oesophageal echocardiography
(a)
the Doppler probe employs high-frequency sound waves
(b)
the Doppler effect is due to a change in frequency of the ultrasound
waves
(c)
ultrasound gives a precise measure of cardiac output
(d)
the speed of medical ultrasound is 1540 m/s
(e)
medical ultrasound passes better through air than blood
(a) true (b)
true (c)
true (d)
true (e)
false
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