2025 · Q106
Which one of the following principles of physics is primarily used in sonography, a medical diagnostic process?
general-sciencephysics-light-electricity
- AResonance
- BSuperposition of waves
- CDoppler effect
- DStanding wave
Explanation
Sonography (ultrasonography) primarily employs the Doppler effect of ultrasound waves: the frequency shift of reflected ultrasound reveals the motion of tissues and blood flow, forming the basis of medical Doppler imaging. It is not based on resonance, superposition or standing waves as the primary principle. Hence the Doppler effect is the answer.