Match the column I with column II and mark the correct option from the codes given below.

Column I		Column II
(a)	String vibration	(i)	Tabla
(b)	Membrane vibration	(ii)	Bicycle bell
(c)	Vibration of air column	(iii)	Sitar
(d)	Vibration of plate	(iv)	Flute

A sound wave travelling in a medium is represented as shown n figure.

If vibrating source of sound makes $360$ oscillations in $2$ minutes, then the amplitude, wavelength and frequency of the sound wave respectively are (Take velocity of sound as $342 {\mathrm{ms}}^{-1}$)

The diagram represents two different sound waves.

The diagram shows the position of the air particles due to propagation of sound, represented by straight lines, at a particular instant from $P$ to $Q$.

Which of the following statements correctly depicts the pressure variation with respect to distance?