What is the frequency range of ultrasonic waves used in echo-cardiography to image heart valves?

Type: MCQ • Marks: 1

A. 100 Hz to 500 Hz

B. 20 Hz to 20 kHz

C. 10 Hz to 20 Hz

D. 1 MHz to 5 MHz

Explanation

Echocardiograms use megahertz-range ultrasound waves for high-resolution heart imaging.

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Class 9th Science (MCQ)

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