A "stationary wave" is formed in a pipe which is open at both ends. If two complete loops are formed and the wavelength of the wave is 10 cm, what is the length of the pipe?
Correct answer: B. 10 cm
- A. 15 cm
- B. 10 cm
- C. 5 cm
- D. 20 cm
Explanation
A pipe whose end opposite to the blowing end is open is called an open organ pipe. If the two loops are formed (the air column in the open organ pipe oscillates for a second harmonic, then the wavelength is L = 2λ2 / 2 L = λ2 As the wavelength is 10 cm then the length of the pipe will also be 10 cm. Hence, B is the correct option.
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About Stationary Waves
Stationary waves form when two waves of the same frequency and amplitude travel in opposite directions and interfere. The topic covers nodes, antinodes, wavelength, phase, resonance, and the allowed frequencies on strings and in air columns. Unlike progressive waves, stationary waves do not transfer energy from one point to another.
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