Correct option: (b) 1 – 15 MHZ
Explanation:
Ultrasound imaging has frequency range 1 - 15 MHz which has become part of our lives in the last decade. We are now all familiar with the blurry and white sonograms (ultrasound pictures) that show the unborn baby inside the mother’ **. Although it may take a little imagination on our part to understand that a round circle is the baby’ head, that does not prevent a proud mother-to-be from showing ** her first baby picture.
