1.

A large number of pendulums with identical bobs (mass m) but varying lengths are suspended from a thick thread. Another pendulum of a heavier bob (mass M) is also suspended from the same thred as shown. This pendulum with the heavier bob is used as a 'driver' to drive the other pendulums called as 'driven' pendulums. Assume that the amplitude of the driver is maintained constant (by some suitable mechanism). Let the frequency of the driver be f_(0) It is observed that

Answer»

all the pendulums EXCEPT ONE are at rest
all the pendulums oscillate in PHASE with the 'driver'
one of the pendulums oscillates with maximum amplitude
the pendulum with maximum amplitude oscillates in phase with the 'driver'

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