there are three strings RP, Pqand QS as shown. Their mass and length are RP = (0.1 kg , 2 m), PQ = ( 0.2 kg , 3 m) ,QS= ( 0.15 kg , 4 m) respectively. All the strings are under the same tension. Wave -1 is incident at P. it is partly reflected (wave -2 ) adn partly transmitted (wave -3) . now wave - 3 is incident at Q . it is again partly transmitted (wave -5)[ and partly reflected (wave -4) . phase difference between wave -1 and wave
A. 2 is `pi`
B. 4 is zero
C. both (a) and (b) are correct
D.
