When sound waves move from one medium to another medium the quantity which remains unchanged is:
Correct answer: B. Frequency
- A. Wavelength
- B. Frequency
- C. Speed
- D. Intensity
Explanation
The frequency of a sound wave is the number of oscillations or cycles per unit of time. It remains constant when sound waves move from one medium to another. This is known as the principle of conservation of frequency.
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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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