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Home » In figure A, B, C and D are the four pendulums suspended from the same elastic string XY. The lengths of pendulum A and D are equal, while the length of pendulum B is shorter and of the pendulum C is longer. The pendulum A is set into vibrations.(a) What is your observation about the vibrations of pendulum D?(b) Give reason for your observation in part (a).(c) What type of vibrations take place in pendulums B and C?(d) Give reason for the answer in part (c)
In figure A, B, C and D are the four pendulums suspended from the same elastic string XY. The lengths of pendulum A and D are equal, while the length of pendulum B is shorter and of the pendulum C is longer. The pendulum A is set into vibrations.
(a) What is your observation about the vibrations of pendulum D?
(b) Give reason for your observation in part (a).
(c) What type of vibrations take place in pendulums B and C?
(d) Give reason for the answer in part (c)
Class 10 | ICSE | Physics | Selina | Sound
In figure A, B, C and D are the four pendulums suspended from the same elastic string XY. The lengths of pendulum A and D are equal, while the length of pendulum B is shorter and of the pendulum C is longer. The pendulum A is set into vibrations.
(a) What is your observation about the vibrations of pendulum D?
(b) Give reason for your observation in part (a).
(c) What type of vibrations take place in pendulums B and C?
(d) Give reason for the answer in part (c)

Set the pendulum A into oscillation by moving it to one side, normal to its length. It is noticed that pendulum D begins vibrating with a tiny amplitude and eventually attains the same amplitude as pendulum A. Due to the constant total energy, when the amplitude of the pendulum D increases, the amplitude of the pendulum A decreases. The amplitude of the pendulum D will decrease with time, whereas the amplitude of the pendulum A will grow. Only between the pendulums A and D can energy exchange occur since their inherent frequencies are the same. In addition, the pendulums B and C have relatively tiny amplitudes of vibration.

Through XY, the vibrations created in pendulum A are conveyed to the other pendulums B, C, and D as forced vibrations. The pendulum D enters a state of resonance, while the pendulums B and C continue to vibrate at a forced rate..

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