When sound waves move from one medium to other medium the quantity which remains unchanged is
Correct answer: B. Frequency
- A. Wavelength
- B. Frequency
- C. Speed
- D. Intensity
Explanation
At a boundary the source determines the oscillation rate; frequency is set by the emitter and stays constant across media. Speed and wavelength adjust to satisfy v = fλ, and intensity may change due to transmission/reflection.
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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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