Question

Which is not a frequency of ultrasound waves?

100,000 Hz
150,000 Hz
5,000 Hz
4,000,000 Hz

Answer 1

5,000 Hz is not a frequency of ultrasound waves. Ultrasound waves refer to sound waves with frequencies higher than the upper limit of human hearing, which is typically around 20,000 Hz. Therefore, all the other options - 100,000 Hz, 150,000 Hz, and 4,000,000 Hz - are valid frequencies for ultrasound waves.