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Question
A long wire PQR is made by joning 2 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 0.20kg. Wire PQR is under tension of 80 N. A sinusoidal wave pulse of amplitude 3.5 cm is sent along the wire PQ from end P. No power is dissipated during propagation of wave pulse. Find the amplitude of reflected wave pulse after the incident wave pulse crosses the joint Q :
- 1.5 cm
- 1.25cm
- 1.75cm
- 2.0cm
The correct answer is: 1.5 cm
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