Ultrasonic Sound

Q. Which of the following correctly represents the increasing order of frequency for infrasound, ultrasound, and audible sound?

1. All sounds are of the same frequency
2. Ultrasound $<$ Audible $<$ Infrasound
3. Infrasound $<$ Audible $<$ Ultrasound
4. Audible $<$ Ultrasound $<$ Infrasound

Q. The ultrasound waves can penetrate into matter to a large extent because they have very high speed.

1. True
2. False