Waves

List-I shows four configurations made of straight and semi-circular narrow tubes containing air. A sound wave of wavelength $\lambda = 0.29\ \mathrm{m}$ enters these structures at the point $S$ and a sound detector is placed at $D$.

Between the points $S$ and $D$, the sound travels only through the tubes. List-II contains the possible smallest values of $l$ (refer to the figures) for which the detector $D$ records maximum amplitude. Ignore effects of sharp corners. [Given $\cos(15^\circ) = 0.97$]

Choose the option that best describes the match between the entries in List-I to those in List-II.

List-I	List-II
(P)	(1) $1.32 \text{ m}$
(Q)	(2) $1.19 \text{ m}$
(R)	(3) $0.51 \text{ m}$
(S)	(4) $0.29 \text{ m}$
	(5) $0.13 \text{ m}$