A sound wave travels from a region of hot air into a region of cold air. How do the frequency and wavelength of sound change?
Correct answer: C. Frequency does not change as wavelength decreases
- A. Frequency decreases wavelength decreases
- B. Frequency increases and wavelength decreases
- C. Frequency does not change as wavelength decreases
- D. The frequency does not change wavelength does not change
Explanation
The wavelength of the sound wave decreases. The frequency of the sound wave stays the same.
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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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