The frequency of ultrasonic waves is:
Correct answer: D. Greater than 20kHz
- A. Lesser than 2kHz
- B. Greater than 2kHz
- C. Lesser than 20kHz
- D. Greater than 20kHz
Explanation
A sound wave is a vibration that is transmitted through a medium, such as air, water, and metals. Ultrasonic wave is defined as "inaudible sound with high frequency for human" the frequency of which generally exceeds 20 kHz. These days, a sound wave which is not intended to be heard is also called an ultrasonic wave.
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About Waves
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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