A platform seating the source of sound emitting sound of frequency n and two detectors D_(1)and D_2 (S, D_(1) & D_2 are at rest with respect to.ihe platform) is moving with a constant velocity of 5ms^(-1) with respect to ground towards a vcrticarwall which in turn is moving away from the platform with a speed of 5 ms^(-1)with respect to ground. Stationary detectors D_3 and D_4 are positioned behind the platform and between the platform and the wall as shown in the figure. Speed of sound in still air is V= 340 ms^(-1) . Take lambda = V//n. In matching the two columns consider the sound received by the detectors directly from the source and also after reflection from the wall. Air is still with respect to ground.

A platform seating the source of sound emitting sound of frequency n a

1.	A platform seating the source of sound emitting sound of frequency n and two detectors D_(1)and D_2 (S, D_(1) & D_2 are at rest with respect to.ihe platform) is moving with a constant velocity of 5ms^(-1) with respect to ground towards a vcrticarwall which in turn is moving away from the platform with a speed of 5 ms^(-1)with respect to ground. Stationary detectors D_3 and D_4 are positioned behind the platform and between the platform and the wall as shown in the figure. Speed of sound in still air is V= 340 ms^(-1) . Take lambda = V//n. In matching the two columns consider the sound received by the detectors directly from the source and also after reflection from the wall. Air is still with respect to ground.
Answer» ANSWER :A-pq; B-pqs; C-q; D-qrs

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