Question

1 A PSc 105 teacher keeps flipping a rope so that a series of pulses of amplitude 0.42 m are sent down a string that is attached to a post at one end. The pulses are reflected at the post and travel back along the string without loss of amplitude and the incoming and reflected waves add through superposition. What is the amplitude at a point on the string where two pulses cross?

Answer 1

y = Asin (wt - ks) %=- Asin (wt tkal y=9, +42 = A sin (wt alen)-Asin (atakse) F-Ara.cos (wt). sinku =-2 A coswt sinkre here Amplitude is 2A sinkre Maximum value = 2A & A=0.42m =) 2A=0.84m