If velocity of sound in a gas is 360 m/s and the distance between a compression and the nearest rarefaction is 1m, then the frequency of sound is:
Correct answer: B. 180 Hz
- A. 90 Hz
- B. 180 Hz
- C. 360 Hz
- D. 720 Hz
Explanation
Distance between a compression and the nearest rarefaction is λ/2 = 1m. Hence f = v/λ = 260/2 = 180 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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