7(c)
Two pendulums C and D are suspended from a wire as shown in the given figure. Pendulum C is made to oscillate by displacing it from it's mean position. It is seen that D also starts oscillating.
(i) Name the type of oscillation, C will execute.
(ii) Name the type of oscillation, D will execute.
(iii) If the length of D is made equal to C, then what difference will you notice in the oscillations of D?
(iv) What is the name of the phenomenon when the length of D is made equal to C?
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(i) C executes free vibrations (damped if medium is present).
(ii) D executes forced oscillation.
(iii) If the length of D is made equal to C, then the amplitude of vibration of pendulum D increases substantially.
(iv) The phenomenon is called resonance.