An open pipe of length 0.85 m resonates at its fundamental frequency. What is this frequency? (Speed of sound = 343 m/s)
Correct answer: B. 202 Hz
- A. 101 Hz
- B. 202 Hz
- C. 303 Hz
- D. 404 Hz
Explanation
For an open pipe, fundamental frequency f1 = v / (2L) = 343 / (2 × 0.85) = 343 / 1.7 ≈ 202 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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