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(D) In the resonance tube experiment,the first resonance occurs at length $l_1 \approx \lambda/4 - e$,where $e$ is the end correction. Since $e > 0$,$

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$(A, D)$

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(D) In the resonance tube experiment,the first resonance occurs at length $l_1 \approx \lambda/4 - e$,where $e$ is the end correction. Since $e > 0$,$l_1$ is slightly shorter than $\lambda/4$. Thus,statement $(D)$ is correct.At the first resonance,the air column is shorter,meaning the damping effect is less compared to the second resonance,resulting in higher intensity of sound. Thus,statement $(A)$ is correct.Statement $(B)$ is incorrect because the prongs are typically held in a vertical plane to ensure the sound waves propagate down the tube.Statement $(C)$ is incorrect because the amplitude of vibration of a tuning fork prong is typically in the range of $1 \ mm$,not $1 \ cm$.

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