A long wire PQR is made by joining two wires PQ and QR of equal radii. PQ has a length 4.8 m and mass 0.06 kg. QR has length 2.56 m and mass 0.2 kg. The wire PQR is under a tension of 80 N. A sinusoidal wave pulse of amplitude 3.5 cm is sent along the wire PQ from the end P. No power is dissipated during the propagation of the wave pulse.
Then what is the and
after the incident wave pulse crosses the joint Q.
The velocity of the wave in PQ wire
The velocity of the wave in QR length
And The expressions for reflected and transmitted amplitudes in terms of
are as follows:
and
So using this we get
i.e. the amplitude of the reflected wave will be 1.5 cm.
The negative sign of indicates that there
will be a phase change of in the reflected wave.
i.e. the amplitude of transmitted wave will be
2.0 cm.
Study 40% syllabus and score up to 100% marks in JEE