science medium true/false

True or False: Ultrasonic waves have frequencies above 20 kHz and are used in medical imaging.

  1. True
  2. False

Answer: True

Ultrasound (>20 kHz) penetrates tissues; echoes create images (sonography). Also used in cleaning, NDT, pest repellents. Non-ionizing and safe for prenatal scans. [[NCERT Physics Class 11]]

Topic Physics - Acoustics
Exam Relevance Railway JE, SSC JE, Banking Specialist Officer

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