MCQ
The graph predicts the condition of: 

- ABody is undergoing positive acceleration.
- ✓Body is undergoing negative acceleration.
- CUniform velocity.
- DUniform speed.

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$(A)$ the intensity of the sound heard at the first resonance was more than that at the second resonance
$(B)$ the prongs of the tuning fork were kept in a horizontal plane above the resonance tube
$(C)$ the amplitude of vibration of the ends of the prongs is typically around $1 \mathrm{~cm}$
$(D)$ the length of the air-column at the first resonance was somewhat shorter than $1 / 4$ th of the wavelength of the sound in air