Consider the following sound waves marked $A$, $B$, $C$ and $D$:

   

Which two waves represent sounds of the same frequency but different loudness?

State whether all these sound waves have been produced by the same vibrating body or different vibrating bodies?

Which vibrating body/bodies could have generated the sound waves shown here?

Anhad adjusts the signal to the loudspeaker to give a sound of frequency $200 \mathrm{H}\mathrm{z}$. What happens to the air in-between Anhad and the loudspeaker?

Anhad adjusts the signal to the loudspeaker to give a sound of frequency $200\mathrm{H}\mathrm{z}$. Explain how Anhad receives sound in both the ears.

On the graph paper given in figure $\mathrm{Y}$, draw a trace of the sound wave, which has a higher frequency than that shown in Figure $\mathrm{X}$.

On the graph paper shown in Figure $Y$, draw a trace of the sound wave, which has a larger amplitude than that shown in figure $X$.