Question

Which of the following statements are correctly associated with ultrasonic waves?
1.These are the acoustic waves of frequencies more than 20,000 Hertz.
2.When possible to use, these waves are preferred over X-rays for getting an image of internal organs because they are not harmful.
3.Their velocity is more than the velocity of sound.

• A. 1 only
• B. 1 and 2
• C. 2 and 3
• D. 1 and 3

Answer 1

The correct option is A 1 only

Option:(a)