Infrasonic waves have a frequency of:
Correct answer: B. Less than 20 Hz
- A. Greater than 20000 Hz
- B. Less than 20 Hz
- C. 20 Hz
- D. Greater than 20 Hz
Explanation
Infrasonic waves are waves with frequencies below the human audible range i.e. 20-20000 Hz
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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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