Q 2) There are 3 pendulums A, B & C. These are kept in your school lab. Lenght of all pendulums is same. Pendulum A is made of Iron, B made of Wood & C made of Plastic. WHose time period is more?
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(i) B and D would be in the state of force vibration.
(ii) Since the length of pendulum C is same as that of A therefore it is in the state of resonance.
(iii) The pendulum C has its length same as that of A therefore its natural time period is also same that of A and both remain in same phase; so resonance takes place. But B's length is lesser than the length of A hence B would vibrate with smaller amplitude
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