A pipe is open at one end and closed at the other with a piston. The piston can slide freely and is at a distance of $$\(4.5 \times 10^{-2} \mathrm{~m}\)$$ from the open end of the pipe. A loudspeaker is positioned near the open end of the pipe and emits a sound wave of a single constant frequency. A stationary wave is formed in the pipe, as illustrated in Fig. 4.1. Fig. 4.1 (i) On Fig. 4.1, draw a letter A at the position of an antinode. (ii) The speed of sound in air is $$\(340 \mathrm{~m} \mathrm{~s}^{-1}\)$$. Determine the frequency of the sound wave. frequency = ................................................ Hz (iii) The piston is moved to the left. The frequency of the sound wave emitted by the loudspeaker is then changed so that a stationary wave is formed with same number of antinodes as in Fig. 4.1. State and explain the change that is made to the frequency of the sound wave. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ................................................................................................................................. .

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