NDA2019General AbilityGeneral ScienceActual
Compared to audible sound waves, ultrasound waves have
Options
- Ahigher speed.
- Bhigher frequency.
- Clonger wavelength.
- DBoth higher speed and frequency.
Correct answer
B. higher frequency.
Step-by-step solution
Audible sounds differ in amount of frequencies being used. For human audible range is between 20 Hz to 20,000 ~Hz . Frequency of ultrasonic is above 20,000 ~Hz .