a) Define an organ pipe. b) What is the ratio of length of two pipes, an open organ pipe A and a closed organ pipe B both vibrating in third…

a) Define an organ pipe. 

b) What is the ratio of length of two pipes, an open organ pipe A and a closed organ pipe B both vibrating in third overtones are in resonance? Justify. 

 c) In the given figure below, figure (i) represents a situation that both source of sound (S) and Listener (L) are at rest position 'S' and 'L' respectively. Figure (ii) represents relative motion between moving source and stationary listener. 

i) Does the pitch of sound changes to the listener in second case? Justify 

ii) Develop an expression to support your answer in (i).

d) Write any two properties of medium which is necessary for the propagation of sound.