Ultrasonic have__________________?
Correct answer: B. frequency is greater than 20 kHz
- A. frequency in the audible range
- B. frequency is greater than 20 kHz
- C. frequency lower than 20 Hz
- D. all of above
Explanation
Ultrasonic waves have frequencies greater than 20 kHz, which is above the upper limit of normal human hearing. Frequencies below 20 Hz are called infrasonic, while audible frequencies lie approximately between 20 Hz and 20 kHz. The likely mistake is choosing the audible range because all are sound waves, although ultrasonic waves are outside human hearing.
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About Progressive Waves
Progressive waves transfer energy through a medium or space while particles oscillate about their equilibrium positions. The work includes amplitude, wavelength, frequency, period, phase difference, wave speed and the progressive wave equation, while distinguishing travelling waves from stationary waves, where the pattern has fixed nodes and antinodes.
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