A tube closed at one end and containing air produces, when excited, the fundamental note of frequency 512 Hz. If the tube is open at both ends, the fundamental frequency that can be excited is (Hz).
Correct answer: A. 1024
- A. 1024
- B. 512
- C. 256
- D. 128
Explanation
Closed tube fundamental fclosed = v/(4L) = 512 ⇒ v/(2L) (open) = 2×512 = 1024 Hz. Therefore opening both ends doubles fundamental frequency.
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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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